Scientific name: Corvus frugilegus
The all-black rook is a sociable bird, so can be spotted in flocks or nesting colonies, known as 'rookeries'. Unlike the similar carrion crow, it has a grey bill and 'baggy trouser' feathers around its legs.
Average lifespan: 6 years
Common. Classified in the UK as Green under the Birds of Conservation Concern 4: the Red List for Birds (2015).