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.
What effect might annual releases of non-native gamebirds be having on native biodiversity?
Henrietta Pringle reveals the work behind a recent paper on gamebirds and predation
Climate change in a warming world
BTO science contributes to our understanding of future scenarios, and informing policies and conservation management strategies to help species adapt.