The Blackbrowed Albatross, or Mollymauk, is found in two varieties (_Thalassogeron melanophrys_ and _T. chrysostoma_). They are found breeding at the north-western end and on the neighbouring islets. Numbers of the former are common; of the latter, rare. Wilkins discovered a nest and egg, and succeeded in obtaining specimens—the first to be collected. He also cinematographed the bird on its nest. The newly hatched chick is covered with light grey down, slightly darker on the wings, and increasing in depth of colour with age. The bill is a dark horn colour, the iris light brown, and the feet light grey. The Giant Petrel—Nellie, or Stinker—(_Ossifraga gigantea_) is found nesting on all the grassy bluffs, but most commonly on the islets of the Bay of Isles, amongst the “Wanderers.” They are exceedingly ugly and ungainly, have an unpleasant smell, and their feathers are infested with ticks. Cape Hens (_Majaqueus aequinoctialis_) are seldom seen near land except in the evening, when they sit at the doors of their burrows chattering away in neighbourly fashion. Wilson Petrels flock in great numbers about the whaling stations. They nest in burrows. The Diving Petrel (_Pelecanoides urinatrix_) frequents the west coast of South Georgia in greatest numbers, but an occasional one may be found at any place near the shore.[19] Whale Birds (_Prion_) are very common on most of the small islands and on some places on the main island. They live in burrows. They are rarely seen by day, as they can only leave and return to the burrows under cover of darkness, for they are preyed upon relentlessly by the skua gulls. They flock out to sea in clouds just after nightfall and return in the early morning. Those which fail to get in by daybreak almost certainly fall victims to the rapacious skuas, which are responsible for the death of thousands of them yearly. They lay a single egg. Cape Pigeons (_Daption capensis_) are the brightest and cheeriest of all seabirds. They frequent the whaling stations in hundreds of thousands. Their chattering and chaffering as they squabble over choice pieces of offal goes on unceasingly all day and all night. They nest in clefts high up in the cliff faces. Snow Petrels (_Pagodroma nivea_) have been seen in the vicinity of the island, but are rare.[20] Silver-Grey Petrels (_Priocella glacialoides_) were seen during our second visit to the island, but are also rare in this locality.