In addition to the penguins numerous other sea birds nest on the islands, as petrels, albatrosses, terns, skuas and prions.
Petrels are archaic oceanic forms, with great powers of flight, dispersed throughout all the seas and oceans of the world, and some species apparently never resort to land except for the purpose of nidification, though nearly all are liable at times to be driven ashore, and often very far inland, by gales of wind.'
But it is in the Southern Ocean that Petrels most abound, both as species and as individuals.
None of the Petrels are endowed with any brilliant colouring - sootyblack, grey of various tints (one of which is often called "blue"), and white being the only hues the plumage exhibits.
The distribution of the several species of Petrels in the Southern Ocean has been treated by A.