By Dominic Mitchell
Following Keith Vinicombe's earlier post on the identification of Common and Arctic Terns in spring and summer, the BTO has released a helpful video illustrating some of the key identification criteria for both species. These have the added benefits of movie sequences and sound recordings, and are well worth viewing as a basic refresher:
There's also a second helpful BTO ID video on Britain's other three breeding terns, Roseate, Sandwich and Little:
See the Bird ID section of the BTO website for more identification tutorials.