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Southern Giant Petrel Video Stock Footage
This and its sister species are the largest members of the Procellariidae. The southern giant petrel measures 86 to 99 cm (34–39 in) with a wingspan of 185 to 205 cm (73–81 in). Both this and the northern giant petrel vary considerably in size, with southern colonies averaging larger than northern colonies, in line with Bergmann's rule. Due to the large amount of size variability, it is difficult to determine which is the larger species, but the largest-bodied colonies of the southern species are slightly larger on average, in both mass and linear dimensions, than the largest in the northern giant petrel. Body mass can vary widely, from 2.3 to 5.6 kg (5.1–12.3 lb), with males averaging larger than females. The largest average weights come from Macquarie Island, where 20 males averaged 5.14 kg (11.3 lb) and 21 females averaged 4.2 kg (9.3 lb). On the South Orkney Islands, 37 males averaged 4.94 kg (10.9 lb) and 37 females averaged 3.85 kg (8.5 lb). In contrast, in Patagonia, 15 males averaged 3.5 kg (7.7 lb) and 21 females averaged 2.5 kg (5.5 lb). However another study from Patagonia, found that 26 males averaged 4.2 kg (9.3 lb) and 27 females averaged 3.7 kg (8.2 lb). They have a very large yellow bill, with a green tip and greyish-brown legs. There are two different morphs, the dark which resembles the northern giant petrel, and the more distin...
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