Gulls & Terns in Gwynedd
Our list for Gwynedd has 12 gulls & terns recorded regularly there: 5 residents, 2 summer visitors, 1 winter visitor, 3 passage migrants and 1 scarce visitor
Most likely in October
GBIF · OctShare of all bird records in Gwynedd in October, 2019–2024. Each month links to that month’s page.
All 12, 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
Lesser Black-backed GullLarus fuscusResidentCommon52–64 cmRecorded all year
Sandwich TernThalasseus sandvicensisSummer visitorCommon36–41 cmRegularly Mar–Sep
KittiwakeRissa tridactylaSummer visitorCommon37–41 cmRegularly Feb–Dec
Common GullLarus canusWinter visitorCommon40–46 cmRecorded all year
Common TernSterna hirundoPassage migrantCommon31–35 cmRegularly Apr–Aug
Arctic TernSterna paradisaeaPassage migrantCommon33–39 cmRegularly Apr–Sep
Mediterranean GullIchthyaetus melanocephalusResidentCommon37–40 cmRegularly Jul–Mar
Little GullHydrocoloeus minutusPassage migrantUncommon25–30 cmRegularly Oct
Little TernSternula albifronsScarceRare21–25 cm
Smallest to largest
Length, cm- Little Tern 21–25 cm
- Little Gull 25–30 cm
- Common Tern 31–35 cm
- Arctic Tern 33–39 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