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The skuas are strong, acrobatic fliers. They are generally aggressive in disposition. Potential predators approaching their nests will be quickly attacked by the parent birds, which usually target the heads of intruders – a practice known as 'divebombing'. [8] Great skua leaving the nest Skua nestling, with egg tooth still present on its beak
The great skua (Stercorarius skua), sometimes known by the name bonxie in Britain, is a large seabird in the skua family Stercorariidae. It is roughly the size of a herring gull . It mainly eats fish caught at the sea surface or taken from other birds.
Brown skua eyeing a king penguin carcass. This is the heaviest species of skua and rivals the largest gulls, the great black-backed gull and glaucous gull, as the heaviest species in the shorebird order although not as large in length or wingspan. [2]
This is the smallest of the skua family at 38–58 cm (15–23 in), depending on season and age. However up to 29 cm (11 in) of its length can be made up by the tail which may include the 15 cm (5.9 in) tail streamers of the summer adult.
The south polar skua is a large bird (though small compared to other skuas sometimes placed in Catharacta) that measures around 53 cm (21 in) in length.Adults are greyish brown above, and have a whitish (pale morph) or straw-brown (intermediate morph) head and underparts, and the contrast between head and body makes it easy to separate from similar species with good views.
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Today one can find the carpets of azorellae only on the islands and islets undamaged by rabbits. The Kerguelen cabbage underwent practically the same fate. The establishment of other mammals also had consequences on the vegetation: consumption of the seeds of the Kerguelen cabbage by mice, reducing its regeneration capacities, consumption of ...
The parasitic jaeger (North America) or Arctic skua (Europe) (Stercorarius parasiticus), is a seabird in the skua family Stercorariidae. It is a migratory species that breeds in Northern Scandinavia , Scotland , Iceland , Greenland , Northern Canada , Alaska , and Siberia and winters across the southern hemisphere.