Identifying small black-headed gulls

A hooded gull in summer is likely to be the ubiquitous Black-headed Gull, but there are a couple of other species that sport the same summer finery. Would you be able to pick out a Little or Mediterranean Gull from the crowd?

BTO bird identification videos are supported by Natureguides

Natureguides kindly provide species video clips for our bird identification videos.

Seabird ID (2 sessions, Tuesdays 10am)

This course involves two weekly online sessions of 100 minutes, with a trainer:participant ratio of about 1:30. Participants' microphones are muted during the sessions but there is a large interactive component, using...

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Blackbird & pulli, photograph by Jill Pakenham

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Too wet to nest?

A common issue that many analysts of biological data encounter is that of detectability. For a human population we can (in principle) count every individual. For wildlife though, things are trickier, and only rarely is...

Identifying small black-headed gulls

BTO bird identification videos are supported by Natureguides

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Seabird ID (2 sessions, Tuesdays 10am)

BTO Data Reports

Too wet to nest?