Farne and Staple Islands - SydsPics
Bamburgh Castle, Northumberland, United Kingdom
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Stay Away - Arctic Tern Alarm Call, Farne Islands

Arctic Tern is one of the most aggressive terns, fiercely defensive of its nest and young. It will attack humans and large predators, usually striking the top or back of the head. Although it is too small to cause serious injury to a human, it is still capable of drawing blood, and is capable of repelling many raptorial birds, polar bears and smaller predators such as foxes and cats.
The species has a variety of calls; the two most common being the alarm call, made when possible predators enter the colonies, and the advertising call. The advertising call is social in nature, made when returning to the colony and during aggressive encounters between individuals. It is unique to each individual tern.