Arctic Tern Nest
Sterna paradisaea

f9 @ 1/1600s, ISO:800, Nikon D300 w 17-55mm @ 44mm

"Arctic Tern," Wikipedia, the free encyclopedia. It 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 an animal of a human's size, it is still capable of drawing blood, and is capable of repelling many raptorial birds and smaller mammalian predators such as foxes and cats. Other nesting birds, such as alcids, often incidentally benefit from the protection provided by nesting in an area defended by Arctic terns. The nest is usually a depression in the ground, which may or may not be lined with bits of grass or similar materials. The eggs are mottled and camouflaged. Both sexes share incubation duties. The young hatch after 2227 days and fledge after 2124 days. If the parents are disturbed and flush from the nest frequently the incubation period could be extended to as long as 34 days.
Cambridge Bay, Nunavut, Canada