Penguins are birds living in the Antarctic and adapted to cold temperature and swimming.
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- Weight: 20–40 kg (44–88 lb)
- Length: 90–110 cm (35–43 in)
- flipper: a wing specialized for rowing
- - The temperature of the arterial blood flowing into the leg is initially about 40 °C (104 °F). If this warm blood entered the feet, which are not insulated by any fat or feathers, it would lose a lot of heat. Heat loss is avoided because arteries carrying warm blood toward the feet run alongside veins carrying cool blood up from the feet. The cold blood flowing towards the heart absorbs heat from the arterial blood, and thus it is warmed, while the arterial blood flowing towards the feet cools down, thus the heat loss is reduced.
This animation demonstrates birds' bones and eggs through the example of the common blackbird.
The characteristic colors of the common kingfisher aid the bird in catching its prey.
This animation demonstrates the anatomy of birds through the example of mallards.
Marsh harriers are birds of prey found almost worldwide.
The saker falcon is a large bird of prey widespread in Europe and and Asia.
The archaeopteryx shows characteristics of both birds and reptiles. It is probably the ancestor of birds.
The Arctic tern is famous for its long migration route: it flies from the Arctic to the Antarctic and back again each year.
The animation demonstrates the most important types of feathers and their fine structure.
Igloos were the typical dwellings built by Eskimos living in the Arctic zone.
Groups of western jackdaws are frequently found in cities. Konrad Lorenz analysed the complex social behaviour of these animals.