Northern Alberta and the region farther north is the nesting-ground of the migratory birds.
They are the home of myriads of sea-birds and one of the nesting-places of the bonxie, or great skua (Lestris cataractes), which used to be fostered by the islanders to keep down the eagles, and the eggs of which are still strictly preserved.
The island is divided into Mainland district (comprising the parishes of Northmavine, Delting, Nesting, Sandsting, Walls, Tingwall, Bressay, Lerwick and Dunrossness) and North Isles district (the parishes of Unst, Fetlar and Yell).
The differentiation of the females leads to a complex social life, the nesting habits of ants and the various industries that they pursue being of surpassing interest (see ANT).
Before winter, all tall grass and loose litter should be taken away; if this is not done, then the first snow should be tramped heavily around the plants, in order to destroy any nesting-places.
The sombre colouring is relieved by vegetation along the edges of the nearly flat beds which project like great cornices and serve as nesting-places for sea-fowl.
Among the solitary bees none has more remarkable nesting habits than the mason bee (Chalicodoma) represented in the south of France and described at length by Fabre.
During a stay of ten days an effort was made to study the nesting habits of the emperor penguin.
This bird is a winter visitor to Britain, and its Arctic nesting-places being then unknown, it was fabled to originate within the shell-like fruit of a tree growing by the sea-shore.