Calybites
@calybites.bsky.social
Interested in birds, butterflies, moths and plants. Helping to monitor the movements of migrating Black-headed Gulls 😀
Roundhay Park, Leeds, today where the Black-headed Gulls provide plenty of interest.
235J has been spotted in Riga, Latvia 🇱🇻 and 236J visits St Petersburg, Russia 🇷🇺
My favourite 288S came to visit me at Yeadon Tarn on New Year’s Eve last year! 😀
#Chroicocephalus #ridibundus
#NWBHGs #GullsOfRoundhay
235J has been spotted in Riga, Latvia 🇱🇻 and 236J visits St Petersburg, Russia 🇷🇺
My favourite 288S came to visit me at Yeadon Tarn on New Year’s Eve last year! 😀
#Chroicocephalus #ridibundus
#NWBHGs #GullsOfRoundhay
December 5, 2025 at 3:19 PM
Roundhay Park, Leeds, today where the Black-headed Gulls provide plenty of interest.
235J has been spotted in Riga, Latvia 🇱🇻 and 236J visits St Petersburg, Russia 🇷🇺
My favourite 288S came to visit me at Yeadon Tarn on New Year’s Eve last year! 😀
#Chroicocephalus #ridibundus
#NWBHGs #GullsOfRoundhay
235J has been spotted in Riga, Latvia 🇱🇻 and 236J visits St Petersburg, Russia 🇷🇺
My favourite 288S came to visit me at Yeadon Tarn on New Year’s Eve last year! 😀
#Chroicocephalus #ridibundus
#NWBHGs #GullsOfRoundhay
Reposted by Calybites
Uit DNA-onderzoek bleek dat ik wel heel veel mannelijke scholeksters ving. Stukje over geschreven.
DNA testing showed that I caught a lot of male oystercatchers. Short story about that (in Dutch, but Google can translate it 😉)
www.scholekster.org/nieuws/hebbe...
DNA testing showed that I caught a lot of male oystercatchers. Short story about that (in Dutch, but Google can translate it 😉)
www.scholekster.org/nieuws/hebbe...
Hebben mannelijke scholeksters een grotere taak in het verdedigen van het territorium? - Stichting Onderzoek Scholekster
De, volgens velen, makkelijkste manier om adulte scholeksters te vangen t.b.v. ringonderzoek is op het nest. Hierbij worden eieren vervangen voor kunsteieren (om beschadiging te voorkomen) en een kooi...
www.scholekster.org
December 2, 2025 at 8:45 PM
Uit DNA-onderzoek bleek dat ik wel heel veel mannelijke scholeksters ving. Stukje over geschreven.
DNA testing showed that I caught a lot of male oystercatchers. Short story about that (in Dutch, but Google can translate it 😉)
www.scholekster.org/nieuws/hebbe...
DNA testing showed that I caught a lot of male oystercatchers. Short story about that (in Dutch, but Google can translate it 😉)
www.scholekster.org/nieuws/hebbe...
I was beginning to think that BHG 2440 had moved away from Yeadon Tarn but was pleased to catch up with it today.
Born at Shotton Steel Works in North Wales (ringed as a nestling) it arrived here 8 weeks ago with assistance from Storm Amy! 🤣
Possibly my #GullOfTheYear
#Chroicocephalus #ridibundus 🏴
Born at Shotton Steel Works in North Wales (ringed as a nestling) it arrived here 8 weeks ago with assistance from Storm Amy! 🤣
Possibly my #GullOfTheYear
#Chroicocephalus #ridibundus 🏴
December 2, 2025 at 3:11 PM
I was beginning to think that BHG 2440 had moved away from Yeadon Tarn but was pleased to catch up with it today.
Born at Shotton Steel Works in North Wales (ringed as a nestling) it arrived here 8 weeks ago with assistance from Storm Amy! 🤣
Possibly my #GullOfTheYear
#Chroicocephalus #ridibundus 🏴
Born at Shotton Steel Works in North Wales (ringed as a nestling) it arrived here 8 weeks ago with assistance from Storm Amy! 🤣
Possibly my #GullOfTheYear
#Chroicocephalus #ridibundus 🏴
Blue Sky in Yorkshire!
Black-headed Gulls continue to arrive back in Otley where there is still some disruption due to the river bridge repairs.
273J is seeking sanctuary on top of the United Reformed Church……next to the Chip Shop! 😀
#GullOfTheDay #GullsOfOtley #Chroicocephalus #ridibundus
#NWBHGs
Black-headed Gulls continue to arrive back in Otley where there is still some disruption due to the river bridge repairs.
273J is seeking sanctuary on top of the United Reformed Church……next to the Chip Shop! 😀
#GullOfTheDay #GullsOfOtley #Chroicocephalus #ridibundus
#NWBHGs
November 30, 2025 at 3:01 PM
Blue Sky in Yorkshire!
Black-headed Gulls continue to arrive back in Otley where there is still some disruption due to the river bridge repairs.
273J is seeking sanctuary on top of the United Reformed Church……next to the Chip Shop! 😀
#GullOfTheDay #GullsOfOtley #Chroicocephalus #ridibundus
#NWBHGs
Black-headed Gulls continue to arrive back in Otley where there is still some disruption due to the river bridge repairs.
273J is seeking sanctuary on top of the United Reformed Church……next to the Chip Shop! 😀
#GullOfTheDay #GullsOfOtley #Chroicocephalus #ridibundus
#NWBHGs
By my calculations at least 72% of the Black-headed Gulls ringed in Yorkshire on 3 Dec 2024 have already returned this autumn. 😀
This includes Otley, Roundhay and Halifax.
waterbirdcolourmarking.org
#Chroicocephalus #ridibundus
#NWBHGs @waterbirdcm.bsky.social
This includes Otley, Roundhay and Halifax.
waterbirdcolourmarking.org
#Chroicocephalus #ridibundus
#NWBHGs @waterbirdcm.bsky.social
November 28, 2025 at 5:20 PM
By my calculations at least 72% of the Black-headed Gulls ringed in Yorkshire on 3 Dec 2024 have already returned this autumn. 😀
This includes Otley, Roundhay and Halifax.
waterbirdcolourmarking.org
#Chroicocephalus #ridibundus
#NWBHGs @waterbirdcm.bsky.social
This includes Otley, Roundhay and Halifax.
waterbirdcolourmarking.org
#Chroicocephalus #ridibundus
#NWBHGs @waterbirdcm.bsky.social
2cy BHG 294S seems to have sneaked back into Otley when I wasn’t looking!🤣
#GullOfTheDay #GullsOfOtley
#Chroicocephalus #ridibundus
#NWBHGs
#GullOfTheDay #GullsOfOtley
#Chroicocephalus #ridibundus
#NWBHGs
November 28, 2025 at 4:58 PM
2cy BHG 294S seems to have sneaked back into Otley when I wasn’t looking!🤣
#GullOfTheDay #GullsOfOtley
#Chroicocephalus #ridibundus
#NWBHGs
#GullOfTheDay #GullsOfOtley
#Chroicocephalus #ridibundus
#NWBHGs
There were approximately 300 Black-headed Gulls at Redcar Tarn, Keighley, today with an Adult:Juvenile ratio in the region of 15:1
I have learned this week that the Adult:Juvenile ratio varies depending on the location.
Is this expected?
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
I have learned this week that the Adult:Juvenile ratio varies depending on the location.
Is this expected?
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
November 27, 2025 at 3:25 PM
There were approximately 300 Black-headed Gulls at Redcar Tarn, Keighley, today with an Adult:Juvenile ratio in the region of 15:1
I have learned this week that the Adult:Juvenile ratio varies depending on the location.
Is this expected?
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
I have learned this week that the Adult:Juvenile ratio varies depending on the location.
Is this expected?
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
There were hundreds of BHGs at Roundhay Park and Soldiers Fields today. Very difficult to count! Maybe 300+
I sampled a group of 60 by the lakeside cafe & 15 of these were hungry juveniles but I suspect that the overall ratio of adults: juveniles in the park would be higher.
@kanebrides.bsky.social
I sampled a group of 60 by the lakeside cafe & 15 of these were hungry juveniles but I suspect that the overall ratio of adults: juveniles in the park would be higher.
@kanebrides.bsky.social
November 26, 2025 at 3:49 PM
There were hundreds of BHGs at Roundhay Park and Soldiers Fields today. Very difficult to count! Maybe 300+
I sampled a group of 60 by the lakeside cafe & 15 of these were hungry juveniles but I suspect that the overall ratio of adults: juveniles in the park would be higher.
@kanebrides.bsky.social
I sampled a group of 60 by the lakeside cafe & 15 of these were hungry juveniles but I suspect that the overall ratio of adults: juveniles in the park would be higher.
@kanebrides.bsky.social
Black-headed Gull 221K is safely back in Roundhay Park, Leeds, today after an excursion to Kochanka, Poland 🇵🇱
#GullOfTheDay #GullsOfRoundhay #Chroicocephalus #ridibundus
#NWBHGs
#GullOfTheDay #GullsOfRoundhay #Chroicocephalus #ridibundus
#NWBHGs
November 26, 2025 at 2:42 PM
Black-headed Gull 221K is safely back in Roundhay Park, Leeds, today after an excursion to Kochanka, Poland 🇵🇱
#GullOfTheDay #GullsOfRoundhay #Chroicocephalus #ridibundus
#NWBHGs
#GullOfTheDay #GullsOfRoundhay #Chroicocephalus #ridibundus
#NWBHGs
Shibden Park, Halifax, today and an early contender for the “Who has the Darkest Head at Christmas?” competition!
a) site: Shibden Park, Halifax
b) date: 25 Nov 2025
c) Number of adults: 118
d) Number of juveniles: 12
#GullsOfHalifax
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
a) site: Shibden Park, Halifax
b) date: 25 Nov 2025
c) Number of adults: 118
d) Number of juveniles: 12
#GullsOfHalifax
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
November 25, 2025 at 3:17 PM
Shibden Park, Halifax, today and an early contender for the “Who has the Darkest Head at Christmas?” competition!
a) site: Shibden Park, Halifax
b) date: 25 Nov 2025
c) Number of adults: 118
d) Number of juveniles: 12
#GullsOfHalifax
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
a) site: Shibden Park, Halifax
b) date: 25 Nov 2025
c) Number of adults: 118
d) Number of juveniles: 12
#GullsOfHalifax
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
Reposted by Calybites
After 8 years & 400 Black-headed Gulls caught & ringed at Center Parcs Sherwood, on Saturday we had our first ever control. Not got the full details yet but we do know it was ringed in June 2003 making it 22 years old.
Ringed under BTO licence.
#ornithology #birdringing #gulls #colourringing
Ringed under BTO licence.
#ornithology #birdringing #gulls #colourringing
November 24, 2025 at 9:33 PM
After 8 years & 400 Black-headed Gulls caught & ringed at Center Parcs Sherwood, on Saturday we had our first ever control. Not got the full details yet but we do know it was ringed in June 2003 making it 22 years old.
Ringed under BTO licence.
#ornithology #birdringing #gulls #colourringing
Ringed under BTO licence.
#ornithology #birdringing #gulls #colourringing
Yeadon Tarn today: 24 November 2025
120 Black-headed Gulls
102 adults and 18 juveniles.
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
120 Black-headed Gulls
102 adults and 18 juveniles.
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
November 24, 2025 at 1:25 PM
Yeadon Tarn today: 24 November 2025
120 Black-headed Gulls
102 adults and 18 juveniles.
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
120 Black-headed Gulls
102 adults and 18 juveniles.
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
50 Black-headed Gulls on the riverside at Wharfemeadows Park, Otley, today (23 November 2025).
45 adults, and
5 juveniles.
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
45 adults, and
5 juveniles.
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
November 23, 2025 at 2:04 PM
50 Black-headed Gulls on the riverside at Wharfemeadows Park, Otley, today (23 November 2025).
45 adults, and
5 juveniles.
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
45 adults, and
5 juveniles.
#Chroicocephalus #ridibundus
#NWBHGs @kanebrides.bsky.social
Reposted by Calybites
At Skinningrove this morning, Common Gull JA875 ringed 19.06.2024 at Kalvøya, Bombehagen, Røst, Nordland, Norway and the regular returning Polish ringed Black-headed Gull ringed 24.06.2021 Legoskie, Wagrowiec, Wielkopolskie
@teesbirds.bsky.social @nybirdnews.bsky.social @northyorksbirds.bsky.social
@teesbirds.bsky.social @nybirdnews.bsky.social @northyorksbirds.bsky.social
November 22, 2025 at 7:30 PM
At Skinningrove this morning, Common Gull JA875 ringed 19.06.2024 at Kalvøya, Bombehagen, Røst, Nordland, Norway and the regular returning Polish ringed Black-headed Gull ringed 24.06.2021 Legoskie, Wagrowiec, Wielkopolskie
@teesbirds.bsky.social @nybirdnews.bsky.social @northyorksbirds.bsky.social
@teesbirds.bsky.social @nybirdnews.bsky.social @northyorksbirds.bsky.social
Yeadon Tarn was partially frozen today but the gulls didn’t seem too bothered. 🥶
c200 Black-headed Gulls vastly outnumbered their grey-legged Common Gull cousins.
Presumably these two species have a common ancestor?
#GullsOfYeadon
#Chroicocephalus #ridibundus
#Larus #canus #Laridae #VC64 #286L
c200 Black-headed Gulls vastly outnumbered their grey-legged Common Gull cousins.
Presumably these two species have a common ancestor?
#GullsOfYeadon
#Chroicocephalus #ridibundus
#Larus #canus #Laridae #VC64 #286L
November 21, 2025 at 4:26 PM
Yeadon Tarn was partially frozen today but the gulls didn’t seem too bothered. 🥶
c200 Black-headed Gulls vastly outnumbered their grey-legged Common Gull cousins.
Presumably these two species have a common ancestor?
#GullsOfYeadon
#Chroicocephalus #ridibundus
#Larus #canus #Laridae #VC64 #286L
c200 Black-headed Gulls vastly outnumbered their grey-legged Common Gull cousins.
Presumably these two species have a common ancestor?
#GullsOfYeadon
#Chroicocephalus #ridibundus
#Larus #canus #Laridae #VC64 #286L
Black-headed Gull 287L is back in Otley after visiting Mablethorpe in the summer.
Perhaps he was on the way back from somewhere across the North Sea?
#GullOfTheDay #GullsOfOtley #Chroicocephalus #ridibundus
#NWBHGs
Perhaps he was on the way back from somewhere across the North Sea?
#GullOfTheDay #GullsOfOtley #Chroicocephalus #ridibundus
#NWBHGs
November 20, 2025 at 2:58 PM
Black-headed Gull 287L is back in Otley after visiting Mablethorpe in the summer.
Perhaps he was on the way back from somewhere across the North Sea?
#GullOfTheDay #GullsOfOtley #Chroicocephalus #ridibundus
#NWBHGs
Perhaps he was on the way back from somewhere across the North Sea?
#GullOfTheDay #GullsOfOtley #Chroicocephalus #ridibundus
#NWBHGs
The cold weather has brought some old friends back to Yeadon Tarn today including Black-headed Gull 241J who is known to visit Finland 🇫🇮
#GullOfTheDay #GullsOfYeadon
#Chroicocephalus #ridibundus
#NWBHGs #Finland #Ornithology
#GullOfTheDay #GullsOfYeadon
#Chroicocephalus #ridibundus
#NWBHGs #Finland #Ornithology
November 19, 2025 at 1:37 PM
The cold weather has brought some old friends back to Yeadon Tarn today including Black-headed Gull 241J who is known to visit Finland 🇫🇮
#GullOfTheDay #GullsOfYeadon
#Chroicocephalus #ridibundus
#NWBHGs #Finland #Ornithology
#GullOfTheDay #GullsOfYeadon
#Chroicocephalus #ridibundus
#NWBHGs #Finland #Ornithology
Merseyside Ringing Group’s Black 2440, the 1cy Black-headed Gull from Shotton Steel Works, Flintshire is still at Yeadon Tarn, Leeds, where it has resided for more than a month.
Hopefully it will stay here for the winter.
#GullsOfShotton 🏴
#GullsOfYeadon #2440 #VC64
#Chroicocephalus #ridibundus
Hopefully it will stay here for the winter.
#GullsOfShotton 🏴
#GullsOfYeadon #2440 #VC64
#Chroicocephalus #ridibundus
November 8, 2025 at 1:21 PM
Merseyside Ringing Group’s Black 2440, the 1cy Black-headed Gull from Shotton Steel Works, Flintshire is still at Yeadon Tarn, Leeds, where it has resided for more than a month.
Hopefully it will stay here for the winter.
#GullsOfShotton 🏴
#GullsOfYeadon #2440 #VC64
#Chroicocephalus #ridibundus
Hopefully it will stay here for the winter.
#GullsOfShotton 🏴
#GullsOfYeadon #2440 #VC64
#Chroicocephalus #ridibundus
The parasitised Luffia lapidella larva hasn’t moved for three days and has fixed itself to the side of the Perspex container.
It will be interesting to see what emerges!
#Psychidae
It will be interesting to see what emerges!
#Psychidae
November 4, 2025 at 3:33 PM
The parasitised Luffia lapidella larva hasn’t moved for three days and has fixed itself to the side of the Perspex container.
It will be interesting to see what emerges!
#Psychidae
It will be interesting to see what emerges!
#Psychidae
BHG 247J has always been faithful to Wharfemeadows Park, Otley, but has now started to visit Yeadon Tarn.
#GullsOfOtley #GullsOfYeadon
#Chroicocephalus #ridibundus
#NWBHGs
#GullsOfOtley #GullsOfYeadon
#Chroicocephalus #ridibundus
#NWBHGs
November 4, 2025 at 2:27 PM
BHG 247J has always been faithful to Wharfemeadows Park, Otley, but has now started to visit Yeadon Tarn.
#GullsOfOtley #GullsOfYeadon
#Chroicocephalus #ridibundus
#NWBHGs
#GullsOfOtley #GullsOfYeadon
#Chroicocephalus #ridibundus
#NWBHGs
Black-headed Gull 2E96 is back in Roundhay Park, Leeds, after yet another trip to Germany! 🇩🇪
Every year, since colour-ringing in 2022, it has spent Spring and Summer at Eider-Sperrwerk, near Vollerwiek, Schleswig-Holstein 🇩🇪
#GullOfTheDay #GullsOfRoundhay
#Chroicocephalus #ridibundus
#NWBHGs #VC64
Every year, since colour-ringing in 2022, it has spent Spring and Summer at Eider-Sperrwerk, near Vollerwiek, Schleswig-Holstein 🇩🇪
#GullOfTheDay #GullsOfRoundhay
#Chroicocephalus #ridibundus
#NWBHGs #VC64
November 3, 2025 at 4:05 PM
Black-headed Gull 2E96 is back in Roundhay Park, Leeds, after yet another trip to Germany! 🇩🇪
Every year, since colour-ringing in 2022, it has spent Spring and Summer at Eider-Sperrwerk, near Vollerwiek, Schleswig-Holstein 🇩🇪
#GullOfTheDay #GullsOfRoundhay
#Chroicocephalus #ridibundus
#NWBHGs #VC64
Every year, since colour-ringing in 2022, it has spent Spring and Summer at Eider-Sperrwerk, near Vollerwiek, Schleswig-Holstein 🇩🇪
#GullOfTheDay #GullsOfRoundhay
#Chroicocephalus #ridibundus
#NWBHGs #VC64
Reposted by Calybites
I've been updating our collaborative #CootStudy database. I started the study 17 years ago & thanks to a network of bird ringers across Britain & Ireland we've now colour-marked 4,400 Coot & received over 13,000 re-sightings. Pretty cool for a bird you hardly see in flight! #Ornithology #BirdRinging
November 2, 2025 at 4:45 PM
I've been updating our collaborative #CootStudy database. I started the study 17 years ago & thanks to a network of bird ringers across Britain & Ireland we've now colour-marked 4,400 Coot & received over 13,000 re-sightings. Pretty cool for a bird you hardly see in flight! #Ornithology #BirdRinging
News from Dean Trenam today.
Black-headed Gull 231C is on the move again. 😀 🇳🇱
I wonder if he will go back to Center Parcs?
#Chroicocephalus #ridibundus
@harrykuipers.bsky.social @nuttytussock.bsky.social
Black-headed Gull 231C is on the move again. 😀 🇳🇱
I wonder if he will go back to Center Parcs?
#Chroicocephalus #ridibundus
@harrykuipers.bsky.social @nuttytussock.bsky.social
November 2, 2025 at 2:37 PM
News from Dean Trenam today.
Black-headed Gull 231C is on the move again. 😀 🇳🇱
I wonder if he will go back to Center Parcs?
#Chroicocephalus #ridibundus
@harrykuipers.bsky.social @nuttytussock.bsky.social
Black-headed Gull 231C is on the move again. 😀 🇳🇱
I wonder if he will go back to Center Parcs?
#Chroicocephalus #ridibundus
@harrykuipers.bsky.social @nuttytussock.bsky.social
The parasitised Luffia lapidella larva, which should have metamorphosed in the summer has made it to Halloween.🎃
It stopped feeding last week and wandered away from the lichen substrate provided for it.
🧙
This Larva Aeterna seems to be the last of the Baildon Luffia colony 😕
#Psychidae #VC64
It stopped feeding last week and wandered away from the lichen substrate provided for it.
🧙
This Larva Aeterna seems to be the last of the Baildon Luffia colony 😕
#Psychidae #VC64
October 31, 2025 at 3:27 PM
The parasitised Luffia lapidella larva, which should have metamorphosed in the summer has made it to Halloween.🎃
It stopped feeding last week and wandered away from the lichen substrate provided for it.
🧙
This Larva Aeterna seems to be the last of the Baildon Luffia colony 😕
#Psychidae #VC64
It stopped feeding last week and wandered away from the lichen substrate provided for it.
🧙
This Larva Aeterna seems to be the last of the Baildon Luffia colony 😕
#Psychidae #VC64