Gulls & Terns in Anglesey
Our list for Anglesey has 13 gulls & terns recorded regularly there: 3 residents, 7 summer visitors, 1 winter visitor and 2 scarce visitors
Most likely in October
GBIF · OctShare of all bird records in Anglesey in October, 2019–2024. Each month links to that month’s page.
All 13, most common first
European Herring GullLarus argentatusResidentCommon55–67 cmRecorded all year
Black-headed GullChroicocephalus ridibundusResidentCommon38–44 cmRecorded all year
Great Black-backed GullLarus marinusResidentCommon64–79 cmRecorded all year
Sandwich TernThalasseus sandvicensisSummer visitorCommon36–41 cmRegularly Apr–Sep
Lesser Black-backed GullLarus fuscusSummer visitorCommon52–64 cmRecorded all year
Arctic TernSterna paradisaeaSummer visitorCommon33–39 cmRegularly Apr–Aug
Common TernSterna hirundoSummer visitorCommon31–35 cmRegularly Apr–Sep
Common GullLarus canusWinter visitorCommon40–46 cmRegularly Aug–Jun
KittiwakeRissa tridactylaSummer visitorCommon37–41 cmRegularly Jan–Nov
Roseate TernSterna dougalliiSummer visitorCommon33–41 cmRegularly May–Jul
Mediterranean GullIchthyaetus melanocephalusSummer visitorUncommon37–40 cmRegularly Jan–Nov
Black TernChlidonias nigerScarceRare22–26 cm
Little GullHydrocoloeus minutusScarceRare25–30 cm
Smallest to largest
Length, cm- Black Tern 22–26 cm
- Little Gull 25–30 cm
- Common Tern 31–35 cm
- Arctic Tern 33–39 cm
- Roseate Tern 33–41 cm
- Sandwich Tern 36–41 cm
- Mediterranean Gull 37–40 cm
- Kittiwake 37–41 cm
- Black-headed Gull 38–44 cm
- Common Gull 40–46 cm
- Lesser Black-backed Gull 52–64 cm
- European Herring Gull 55–67 cm
- Great Black-backed Gull 64–79 cm
Body length, bill to tail. Rare birds in grey.
Data: EOD – eBird Observation Dataset (Cornell Lab of Ornithology), accessed via GBIF.org, CC BY 4.0. Records from 2019–2024, aggregated and filtered by Birdfact. How these lists are made