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
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
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
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
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
Nothing too exciting amongst the many Black-headed Gulls in Shibden Park, Halifax today but BHG 233K did apparently visit Rodley Nature Reserve last winter.
#GullOfTheDay
#GullsOfHalifax #Chroicocephalus #ridibundus
#NWBHGs
#GullOfTheDay
#GullsOfHalifax #Chroicocephalus #ridibundus
#NWBHGs
October 30, 2025 at 3:22 PM
Nothing too exciting amongst the many Black-headed Gulls in Shibden Park, Halifax today but BHG 233K did apparently visit Rodley Nature Reserve last winter.
#GullOfTheDay
#GullsOfHalifax #Chroicocephalus #ridibundus
#NWBHGs
#GullOfTheDay
#GullsOfHalifax #Chroicocephalus #ridibundus
#NWBHGs
The 1cy Black-headed Gull ringed as a nestling in June by Merseyside Ringing Group at Shotton Steel Works, Flintshire is still at Yeadon Tarn, Leeds where it has resided for at least three weeks.
#GullsOfShotton 🏴
#GullsOfYeadon #2440 #VC64
#Chroicocephalus #ridibundus
#GullsOfShotton 🏴
#GullsOfYeadon #2440 #VC64
#Chroicocephalus #ridibundus
October 29, 2025 at 12:55 PM
The 1cy Black-headed Gull ringed as a nestling in June by Merseyside Ringing Group at Shotton Steel Works, Flintshire is still at Yeadon Tarn, Leeds where it has resided for at least three weeks.
#GullsOfShotton 🏴
#GullsOfYeadon #2440 #VC64
#Chroicocephalus #ridibundus
#GullsOfShotton 🏴
#GullsOfYeadon #2440 #VC64
#Chroicocephalus #ridibundus
Black-headed Gull 239J is back at Yeadon Tarn. 😀
There were no summer sightings this year but in 2024 it visited Nordjylland, Denmark, so it is probably safe to assume that it has been there again.
🇩🇰 BHGs are creatures of habit! 🇩🇰
#GullOfTheDay #GullsOfYeadon #Chroicocephalus #ridibundus
#NWBHGs
There were no summer sightings this year but in 2024 it visited Nordjylland, Denmark, so it is probably safe to assume that it has been there again.
🇩🇰 BHGs are creatures of habit! 🇩🇰
#GullOfTheDay #GullsOfYeadon #Chroicocephalus #ridibundus
#NWBHGs
October 27, 2025 at 1:47 PM
Black-headed Gull 239J is back at Yeadon Tarn. 😀
There were no summer sightings this year but in 2024 it visited Nordjylland, Denmark, so it is probably safe to assume that it has been there again.
🇩🇰 BHGs are creatures of habit! 🇩🇰
#GullOfTheDay #GullsOfYeadon #Chroicocephalus #ridibundus
#NWBHGs
There were no summer sightings this year but in 2024 it visited Nordjylland, Denmark, so it is probably safe to assume that it has been there again.
🇩🇰 BHGs are creatures of habit! 🇩🇰
#GullOfTheDay #GullsOfYeadon #Chroicocephalus #ridibundus
#NWBHGs
The Black-headed Gull TCML seen in Shibden Park, Halifax, on 5th September 2025 was ringed (as an adult) in Poland on 28 June. 🇵🇱
#GullsOfHalifax
#Chroicocephalus #ridibundus
#GullsOfHalifax
#Chroicocephalus #ridibundus
October 22, 2025 at 1:20 PM
The Black-headed Gull TCML seen in Shibden Park, Halifax, on 5th September 2025 was ringed (as an adult) in Poland on 28 June. 🇵🇱
#GullsOfHalifax
#Chroicocephalus #ridibundus
#GullsOfHalifax
#Chroicocephalus #ridibundus