Glow Worms at Sherwood Forest 2009
Click here for details of individual females during 2009
2009 Glow Worms - a detailed summary
 
The 2009 glowing season has now ended, but started a week earlier than in 2008.

Females at both Clipstone Old Quarter and Sherwood Heath were monitored throughout the course of the Spring and Summer, producing extremely contrasting data. It appears that Clipstone Old Quarter produced the highest counts of females from any site across the UK.

Left:- The weekly maximum counts of female Glow Worms at Clipstone Old Quarter in 2009.

     
End of season summary - August 5th 2009

The last two females were thought to have been recorded on July 28th, but amazingly, Female 382 appeared again on August 2nd and finally switched off on August 5th. She glowed for a record of 25 days. A total of 385 females were found at Clipstone Old Quarter during the course of the Spring and Summer, peaking very early this year at 85 females on June 8th.

Below:- Satellite image showing the locations of female Glow Worms at Clipstone Old Quarter during the Spring and Summer of 2009.

 
 
Glow Worm larvae in Spring 2009

A total of 94 larvae were found between March 9th and May 23rd during evening walks at the Clipstone Old Quarter site in Sherwood Forest, after which we commenced daily searches for the first glowing females. We measured all larvae found and the distribution of larval sizes by week during Spring 2009 are shown in the graph below. The larval total almost certainly includes some recaptures and we may look into the possibility of marking larvae found in 2010.

     
     
2009 Glow Worm sightings
Glow Worms (both adults and larvae) were recorded as follows.....L = larva ..... M = male .....F = female
 
Date   Stage   Additional notes
................   L M F ........  
March 9th   1 0 0   Found underneath pieces of old bark lying flat on sparsely vegetated ground. Larva was active and eating a Snail. Larval length 22mm.
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March 21st   0 0 0   None found. Weather dry, clear and fairly cool.
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April 5th   1 0 0   Found on footpath late evening at 19:55h. Larval length 23mm. Weather largely clear and quite mild, dry.
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April 6th   2 0 0   Found on footpath late evening after 20:05h. Larval lengths 23mm and 24mm. We had also searched the same footpath (unsuccessfully) during the afternoon. Weather dry, partly overcast and mild.
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April 8th   0 0 0   None found. Weather clear and dry but quite mild.
........
April 9th   5 0 0   Five larvae found on edge of footpath between 19:40 and 20:15h. Weather cloudy and mild, with some rain during the day. Larval lengths showed some variation this evening, being measured at 16mm, 18mm, 22mm (x2) and 24mm.
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April 11th   0 0 0   None found. Weather fairly mild after rain for much of the day.
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April 12th   6 0 0   A total of six larvae found in short grass along the path edge. Five of the larvae found this evening, were noticably larger than previous with measurements, ranging from 22mm x 4.5mm, through to the largest which measured 25mm x 5.5mm. The small larva measured 18mm x 3.5mm. The positions of all larvae were marked when found and when checked again 20 minutes later, all larvae were found retreating back into the vegetation. Weather cloudy and dry. Site visited between 19:10h - 20:15h.
........
April 13th   1 0 0   Just one larvae found this evening, just off the edge of the path. Larval length was 22mm x 4mm. Weather partially cloudy and mild. Dry and warm during the day. Site visited between 19:05h - 20:10h.
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April 14th   2 0 0   Two larvae found along edge of path. Sizes were 22mm x 5mm and 18mm x 3.5mm. Weather dry and overcast, fairly mild. Site visited between 19:00h - 20:20h.
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April 15th   5 0 0   A total of five larvae this evening, all of which were considerably more active than larvae of previous three visits. Weather partially overcast and fairly mild, slight breeze but larval site sheltered. Site visited between 19:10h - 20:20h. There were two distinct larval sizes this evening. Three larger larvae measuring between 23mm x 4.5mm and 25mm x 5mm. Smaller larvae measured 15mm x 3mm and 16mm x 3.5mm.
........
April 17th   2 0 0   Two active larvae this evening, measuring 19mm x 3.5mm and 16mm x 2.5mm (smallest recorded to date) Site was visited from 19:00h - 19:55h. Weather dry, fine and clear, with some rain during much of the day.
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April 18th   0 0 0   No larvea found. Site was visited from 19:10h - 20:10h. Weather dry, fine and clear, becoming cool after warm day.
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April 19th   1 0 0   Just one active larvae found in the middle of the path this evening, measuring 18.5mm x 3.5mm. Site was visited from 19:15h - 20:25h. Weather dry, fine and clear, becoming cool after warm day.
........
April 20th   1 0 0   Just one active larvae this evening, but slightly larger than many of late, measuring 23mm x 5mm. Site visited from 19:20h - 20:20h. Weather dry, fine and clear.
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April 21st   1 0 0   A single large larvae found, measuring 25mm x 5mm. Site visited from 19:30h - 20:30h. Weather dry, fine and clear, slightly warmer than previous visit.
........
April 22nd   4 0 0   Four larvae found this evening. Larval measurements were 20mm x 4mm, 25mm x 5mm, 26mm x 5.5mm and 26mm x 6mm. Site visited from 19:10h - 20:25h. Weather dry, fine and clear and again slightly warmer than previous visit.
........
April 23rd   2 0 0   Two large larvae found, with sizes of 25mm x 5mm and 23mm x 4.5mm. We also found a single dead larva on the edge of the path. Site visited from 19:15h - 20:20h. Weather still dry, fine and clear.
........
April 24th   1 0 0   One larva found just off the edge of the path in grass, size 17mm x 3.5mm. Site visited from 18:50h - 20:00h. Weather dry, fine and clear.
........
April 25th   1 0 0   Just one large larva found on the edge of the path this evening, measuring 26mm x 6mm, equalling the largest larva found to date. Site was visited from 19:10h - 20:20h. Weather dry, fine and clear.
........
April 26th   3 0 0   Three fairly large larvae found. Sizes included 23mm x 4.5mm, 22mm x 4.5mm and 22mm x 4mm. Site visited from 18:50h - 20:00h. Weather dry, fine and clear.
........
April 27th   3 0 0   Another three larvae found, with sizes of 23mm x 4.5mm, 23mm x 5mm and 25mm x 6mm. Larvae were quite active and found either on the path, or at the edge. Site visited from 19:30h - 20:40h. Weather dry, after rain for much of the day. Conditions cooler than of recent evenings.
........
April 28th   2 0 0   Two larvae found this evening, measuring 22mm x 4.5mm and 26mm x 6mm. Site visited from 19:25h - 20:35h. Weather dry, after rain during the afternoon and mild.
........
April 29th   9 0 0   A record nine larvae found this evening, with all measuring over 20mm. Weather dry and quite warm. Site visited from 19:10h - 20:40h.
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April 30th   3 0 0   Three larvae found this evening, despite what seemed to be identical conditions again. Two larvae were large (26mm x 6mm and 27mm x 6mm) with another measuring 20mm x 4.5mm.
........
May 2nd   8 0 0   Another good larval count this evening, with larval sizes ranging from 21mm x 4mm, to 25mm x 5mm. Weather dry and again feeling quite warm. Site visited from 18:50h - 20:30h.
........
May 3rd   0 0 0   No larvae found this evening, probably attributable to the much cooler conditions. Weather dry, breezy and feeling considerably cooler than on recent evenings. Site visited from 19:00h - 20:30h.
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May 4th   2 0 0   Two larvae (lengths of 25mm x 5mm and 23mm x 4mm) Weather was dry and milder than May 3rd, but still breezy. Site visited from 18:55h - 20:25h.
........
May 5th   7 0 0   A total of seven larvae found, two of which were under 20mm in length. Weather was dry and mild, but still breezy. Site visited from 19:00h - 20:20h.
........
May 6th   5 0 0   A total of five larvae were found this evening. Weather was dry, mild and windy. Site visited from 19:00h - 20:50h.
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May 7th   2 0 0   Two larvae (lengths of 23mm x 4mm and 25mm x 5mm) found this evening. Weather dry, slightly cooler than on May 6th and windy. Site visited from 19:15h - 20:30h.
........
May 8th   4 0 0   A total of Four larvae found, sizes 25mm x 5mm, 23mm x 4mm, 20mm x 3.5 and 24.5mm x 5mm. Weather dry, and windy. Site visited from 19:15h - 20:35h.
........
May 9th   2 0 0   Two larvae (lengths of 22mm x 3.5mm and 25mm x 4mm) found this evening. Weather dry, Site visited from 19:10h - 20:20h.
........
May 10th   3 0 0   Three larvae found this evening, (25mm x 5mm and 21mm x 4mm) with another measuring 24mm x 5mm. Weather dry, light wind, with site visited from 19.15h - 20.25h.
........
May 11th   3 0 0   Three larvae again this evening, two of which were quite small. Sizes were 26mm x 6mm, 20mm x 4mm with another measuring 20mm x 3.5mm. Weather dry and cool in an easterly wind, with site visited from 19.25h - 20.25h.
........
May 12th   3 0 0   Three larvae found this evening, which measured 20mm x 4mm and 18mm x 3mm with another at 14mm x 3mm. There appears to be a trend developing, with more smaller larvae now being found. Weather dry, light wind, with site visited from 19.10h - 20.15h.
........
May 15th   0 0 0   No larvae found this evening, Weather, breezy and feeling considerably cooler than on recent evenings. Site visited from 20:05h - 20:45h.
........
May 16th   0 0 0   No larvae found this evening. Weather breezy and feeling cool after rain most of the day. Site visited from 19:35h - 20:40h.
........            
May 17th   0 0 0   No larvae found this evening. Weather breezy and feeling cool after rain most of the day. Site visited from 19:45h - 20:45h.
........            
May 18th   0 0 0   No larvae found this evening. Weather breezy and feeling cool rain most of the day. Site visited from 18:45h - 19:35h.
........
May 19th   1 0 0   Just one large larva found on the edge of the path this evening, measuring 25mm x 6mm, Weather dry and breezy. Site was visited from 19:20h - 20:25h.
........
May 20th   0 0 0   No larvae found this evening. Weather dry after heavy shower but warm . Site visited from 19:25h - 20:35h.
........
May 21st   0 0 0   No larvae found this evening and a later search for adults proved still, to be too early. Weather dry after a heavy shower, but warm . Site visited from 19:25h - 20:35h.
........
May 22nd   1 0 0   Just one large larva found on the edge of the path this evening, measuring 21mm x 4.5mm, Weather dry and light breezy. Site was visited from 19:30h - 20:35h.
........
May 23rd   0 0 0   No larvae found this evening and a later search for adults again proved negative. Weather dry and warm . Site visited from 20:45h - 22:35h.
........
May 24th   0 0 0   No adults found. Weather dry and warm . Site visited from 21:45h - 22:45h.
........
May 25th   0 0 0   No adults found. Weather, heavy shower before visit but warm . Site visited from 21:50h - 22:40h.
........
May 26th   0 0 0   No adults found. Weather, dry and feeling cool. Site visited from 22:10h - 23:00h.
........
May 26th   0 0 0   No adults found. Weather, dry and feeling cool. Site visited from 23:10h - 23:30h.
........
May 27th   0 0 2   Two females found, precisely a week earlier than the first adult in 2008. Weather, dry and feeling mild. Site visited from 22:55h - 23:40h.
........
May 28th   0 0 2   Two females present, but one of last night's females had gone (mated or predated?) The new female was found along a wide woodland track, in the same place where we our furthest record west last year. Weather, dry and warm. Site visited from 22:10h - 23:10h.
........
May 28th   0 0 0   No adults found, Weather, dry and still quite warm, with low mist forming. Site visited from 23:20h - 23:40h.
........
May 29th   0 3 4   Four females and three males found this evening. Among them were the missing female from last night, which reappeared again and two new females. One of the new females was found with a male and the very brief glows of two males, were seen nearby. Weather was again dry and quite warm, with a light breeze. Site visited from 22:30h - 23:20h.
........
May 30th   0 0 1   One glowing female found this evening, which was new, no sign of any other females. Weather, dry and feeling cool. Site visited from 22:10h - 23:25h.
........
May 31st   0 0 5   Five females found this evening, Including two new females. One of the original females from May 29th reappeared again. Weather, dry and feeling cool. Site visited from 22:00h - 23:10h.
........
June 1st   0 0 9   Nine females found this evening, Including five new females. Female 3 was glowing for the first time since May 29th. All but one females are situated along the forest track and in sections from where there were few records in 2008. Weather, dry and quite warm . Site visited from 22:10h - 23:35h.
........
June 2nd   0 0 20   A total of 20 glowing females found tonight. There had obviously been a large emergence during the day, but these emergences are quite restricted to specific areas on site and some areas still remain totally free of any females. Today has seen the last of the hot, sunny weather, which has no doubt helped speed up the development from larva to adult. Weather, dry and warm . Site visited from 22:00h - 00:00h.
........
June 3rd   0 0 1   One glowing female found this evening, no sign of any other females. Weather, dry and very cool. Site visited from 22:10h - 23:30h.
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June 4th   0 0 26   A total of 26 glowing females found tonight. Another large emergence during a warmer day, with 20 new females. Weather, dry and warm . Site visited from 21:50h - 23:50h.
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June 5th   0 0 5   Five glowing females found tonight. Weather, heavy rain, breezy and mild. Site visited from 22:30h - 23:20h.
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June 6th   0 0 19   A total of 19 glowing females found tonight, including six new females. Weather, heavy rain most of the day , breezy and mild. Site visited from 22:10h - 23:50h.
........
June 7th   0 0 9   A total of nine glowing females found tonight, including one new female (Female 56). Weather, heavy rain most of the day and mild. Site visited from 22:10h - 23:20h.
........
June 8th   0 4 85   A record site total of 85 glowing females found tonight, plus four males. 63 new females were found, all this coinciding with the first dry day since June 4th. Weather dry and mild. Site visited from 22:10h - 00:35h.
........
June 8th   0 0 27   A total of 27 glowing females found during a brief early morning hours visit. Weather dry and mild. Site visited from 00:50h - 01:05h.
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June 9th   0 1 53   A total of 53 glowing females found tonight, plus one male. Eight new females were found. Weather dry and mild. Site visited from 22:10h - 00:10h.
........
June 10th   0 4 45   A total of 45 glowing females found tonight, plus four males with females. 14 new females were found. Weather persistant light rain throughout . Site visited from 21:55h - 23:45h.
........
June 11th   0 1 5   Only five glowing females found tonight, despite a fine day. No females found in large grassy area Weather, dry and clear . Site visited from 22:00h - 23:50h.
........
June 12th   0 3 20   A total of 20 glowing females found tonight. No females were found in large grassy area. Weather dry and warm. Site visited from 22:10h - 00:05h.
........
June 13th   0 1 10   A total of ten glowing females found tonight. One female found in the large grassy area. Weather dry and warm. Site visited from 22:10h - 23:35h.
........
June 13th   0 0 1   Just a single female found, which was right on the edge of the car park. It seems that numbers at this site have dropped as rapidly as those at Clipstone Old Quarter. Weather dry and very mild. Site visited from 23:45h - 00:05h.
........
June 14th   0 3 10   A total of ten glowing females found tonight. plus three males (two of which were with females). Weather dry and warm. Site visited from 22:10h - 23:40h.
........
June 15th   0 1 4   Just four females and one male located this evening, but heavy showers during the afternoon probably affected the count. Weather dry and mild after heavy afternoon showers. Site visited from 22:10h - 23:35h.
........
June 16th   0 2 10   Ten females this evening, five of which were new. Two males were also present with females. Weather dry and mild. Site visited from 22:10h - 23:50h.
........
June 16th   0 0 0   No females present this evening during a brief, late search, Weather dry and quite mild. Site visited from 00:10h - 00:20h.
........
June 16th   0 0 0   No females found. Weather dry and quite mild. Site visited from 00:25h - 00:35h.
........
June 17th   0 1 0   No females this evening, just one male. Weather dry and quite mild after rain for much of the day. Site visited from 22:10h - 23:00h.
........
June 18th   0 2 19   A total of 19 glowing females found tonight, plus two males with females. The fact that there were 18 new females in the open grassy area, came as something of a surprise, considering that new females in this section had been reduced to just two in the last week. Weather dry and warm. Site visited from 22:10h - 23:45h.
........
June 19th   0 1 10   Ten females this evening, One male present with a female. Weather dry and mild. Site visited from 22:10h - 23:30h.
........
June 19th   0 0 1   One glowing female found this evening, but no sign of any other females. Weather, dry and mild. Site visited from 23:10h - 00:10h.
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June 20th   0 1 17   13 new females along with three older females present this evening. Female 147 remains the longest glowing (nine days) present. Weather dry, clear and mild. Site visited from 22:10h - 23:40h.
........
June 20th   0 0 1   A second glowing female found late evening, but no sign of the female present on June 19th. Weather, dry and still mild. Site visited from 23:55h - 00:20h.
........
June 21st   0 1 15   New females continue to appear, with another eight being new tonight. One female was found in a new area of the forest. Weather, dry and warm. Site visited from 22:10h - 00:00h.
........
June 22nd   0 4 12   12 females this evening, Four males were also found. Weather very warm and humid with rain . Site visited from 22:20h - 23:40h.
........
June 23rd   0 3 12   12 females, eight of which were know . Two males were attracted to sound recording equipment. Weather warm and dry. Site visited from 22:20h - 00:10h.
........
June 24th   0 2 16   New females continue to hatch with ten being new this evening, out of a total of 16. Weather was very mild, dry and overcast. Sute visited from 22:15h - 23:45h.
 
June 25th   0 1 29   29 females this evening, 21 of which were new. This represents the largest hatching of new females since June 8th. One male was found with a female. Weather dry and mild. Site visited from 22:10h - 23:55h.
........
June 25th   0 0 2   Just two females found. Weather dry and mild. Site visited from 00:05h - 00:20h.
........
June 26th   0 5 26   26 females this evening, 16 of which were new. An increase in numbers in a new area of the site. Weather dry and mild. Site visited from 22:15h - 23:55h.
........
June 27th   4 2 26   16 new females out of a total of 26 again, but we also found four larvae on one path. Larval sizes were 13mm x 3.5mm, 15mm x 4.5mm and 17mm x 4.5mm. Weather dry, cloudy and. warm. Site visited from 22:10h - 00:25h.
........
June 28th   0 2 28   28 females this evening, 20 of which were new. The increase in numbers in a new area of the site continues. Weather dry and warm. Site visited from 22:10h - 00:05h.
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June 29th   0 1 24   24 females, including 13 new females. Three females were found in yet another new area of the site. Weather dry and very warm. Site visited from 22:10h - 00:15h.
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June 30th   0 3 22   22 females, with 11 new females. Weather dry and very warm. Site visited from 22:10h - 00:00h.
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July 1st   0 1 20   20 females, of which 11 were new. Weather dry and very warm. Site visited from 22:10h - 00:20h.
........
July 2nd   0 3 19   19 females, with just nine new females. Weather dry and very warm. Site visited from 22:10h - 00:10h.
........
July 2nd   0 0 1   One female present this evening. Weather dry and very warm. Record per K. Stander
........
July 3rd   0 0 7   Torrential rain for most of the morning, resulted in just seven glowing females this evening. Site visited from 22:20h - 23:50h. Weather clear, dry and mild.
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July 4th   0 2 14   14 females, with five new females. Weather dry and warm. Site visited from 22:20h - 23:55h.
........
July 4th   0 0 7   A total of seven females present this evening. Weather dry and warm. Record per K. Stander
........
July 5th   0 3 14   14 females were found tonight, with seven new females. Weather dry and warm. Site visited from 22:10h - 23:50h.
........
July 6th   0 0 7   Seven females were found tonight, with one new female. Weather, evening dry after heavy showers during the day. Site visited from 22:15h - 23:35h.
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July 7th   0 2 12   12 females were found tonight, with two new females. Weather, late evening becoming dry after very heavy showers during the day and early evening. Site visited from 22:25h - 00:05h.
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July 8th   0 0 13   13 females were found tonight, with one new female. Weather, dry and mild. Site visited from 22:15h - 23:45h.
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July 9th   0 0 11   11 females, including two new females. Weather, dry and mild after showery rain most of the morning. Site visited from 22:05h - 23:40h.
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July 10th   0 0 9   Nine females tonlght. Weather, dry and felling cool. Site visited from 22:10h - 23:40h.
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July 11th   0 0 13   13 females found tonlght. Weather, heavy showers and mild. Site visited from 22:00h - 23:20h.
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July 12th   0 0 11   11 females were found tonlght, with three new females. Weather, dry and mild after a light shower. Site visited from 22:10h - 23:50h.
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July 13th   3 1 15   15 females found tonlght, with two new females. Weather, mild after showers during the early evening. One larva measured at 10mm x 3mm. Site visited from 22:10h - 23:55h.
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July 14th   0 0 11   A total of 11 females were found tonlght. Weather, mild with a heavy shower during visit. Site visited from 22:10h - 00:05h.
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July 15th   0 0 10   Ten existing females were found tonlght. Weather, mild with rain during the morning. Site visited from 22:15h - 23:40h.
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July 16th   0 0 8   Eight glowing females found in persistant rain this evening. Weather, still very mild with steady rain. Site visited from 22:10h - 23:10h.
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July 17th   0 0 6   Six glowing females found this evening. Weather, still mild with persistent rain most of the day and during the evening. Site visited from 22:10h - 23:00h.
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July 18th   0 0 11   11 females were found tonlght, with one new female. Weather, dry and mild. Site visited from 22:05h - 23:30h.
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July 19th   0 0 9   Nine females found tonlght, Weather, mild with some torrential showers during the afternoon. Site visited from 22:00h - 23:10h.
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July 20th   0 0 8   Eight females found tonlght, with one new female. Weather, dry and mild. Site visited from 22:10h - 23:25h.
........
July 21st   0 0 8   Eight females found this evening. Weather, mild with rain most of the day. Site visited from 22:10h - 23:20h.
........
July 22nd   0 0 7   Seven females found tonight. Female 366 was glowing for it`s 18th consecutive evening, which is a record. Weather, mild with rain most of the day. Site visited from 22:00h - 23:20h.
........
July 23rd   0 0 7   Seven females found this evening. Female 366 was glowing for it`s 19th consecutive evening, but had moved one metre from last night`s position. Weather, mild and dry. Site visited from 22:05h - 23:20h.
........
July 23rd   0 0 1   One female present this evening. Weather, mild and dry. Record per A. Chandler.
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July 24th   0 0 5   Only five glowing females found tonight, including Female 366. Weather, dry and mild. Site visited from 22:00h - 23:00h.
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July 25th   0 0 4   Four glowing females found tonight. Weather, dry and mild. Site visited from 22:10h - 23:20h.
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July 26th   0 0 3   Three glowing females tonight. Weather, mild with rain most of the afternoon and evening. Site visited from 22:00h - 23:05h.
........
July 27th   0 0 1   Just one glowing female tonight. Female 382. Weather, mild with a shower during the afternoon. Site visited from 22:00h - 23:00h.
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July 28th   0 0 2   Two glowing females tonight, Weather, mild with a rain during the evening. Site visited from 22:00h - 23:05h.
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July 29th   0 0 0   No females found this evening. Weather, mild with heavy rain during the day. Site visited from 21:55h - 22:45h.
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July 30th   0 0 0   No females found again. Weather, showers during the day, evening dry and clear. Site visited from 21:45h - 22:40h.
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July 31st   0 0 0   No females found again tonight. Weather, mild and rain during the evening. Site visited from 21:40h - 22:30h.
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August 1st   0 0 0   No females found. Weather, mild with rain for most of the afternoon and evening. Site visited from 21:45h - 22:25h.
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August 2nd   0 0 1   Amazingly, Female 382 reappeared again this evening after an absence of four nights. Weather, dry and mild. Site visited from 21:50h - 22:35h.
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August 3rd   3 0 1   Female 382 is still present and three lavae found. Laval measurements were 13mm, 15mm and 16mm. Weather, dry and warm. Site visited from 21:55h - 22:55h.
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August 4th   10 0 1   Female 382 still glowing this evening, but observations showed an increased amount of restlessness and eventually moved from her original site. Also a minimum of ten larvae found, of which seven were measured and showing size ranges from 13mm-21mm lengths. Weather, warm with light rain. Site visited from 21:30h - 23:00h.
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August 5th   1 0 1   Female 382 present and glowing very dim for just under an hour, before turning off her light and moving off. This was her 25th night glowing, which is the longest of any of this year's females and it seemed appropriate that she switched off whilst we were watching her. Weather, warm and mild after rain most of the morning. Site visited from 21:45h - 23:00h.
........
Female glowing plates 2009
 
Photographs showing the glowing plates from different head on angles, of a Clipstone Old Quarter female (Female 006) on May 31st 2009. Compare the brightness of this females plates, to those of two extremely dim glowing females (Female 277 and Female 293) which were still present on July 8th. Both these females were barely visible from more than a metre distance. Two other females which have glowed very dim, have also been recorded through the season to date.
 
   
   
     
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