Identifying adult black-backed gulls
On paper Lesser and Great Black-backed Gulls are straightforward to separate but, in reality, many of us struggle - especially as the light conditions can alter their colour and size is not always apparent. Watch our video to tell these two species apart, as well as differentiate them from Herring Gull.
BTO bird identification videos are supported by Natureguides
Natureguides kindly provide species video clips for our bird identification videos.
BTO and the Cambridge Conservation Initiative
Learn about our partnership with the CCI and how it helps us contribute to bird conservation on a global scale.