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Bird - Wikipedia
Birds are a group of warm-blooded vertebrates constituting the class Aves , characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 … Meer weergeven
The first classification of birds was developed by Francis Willughby and John Ray in their 1676 volume Ornithologiae. Carl Linnaeus modified that work in 1758 to devise the Meer weergeven
Compared with other vertebrates, birds have a body plan that shows many unusual adaptations, mostly to facilitate flight Meer weergeven
Birds occupy a wide range of ecological positions. While some birds are generalists, others are highly specialised in their … Meer weergeven
Human activities have caused population decreases or extinction in many bird species. Over a hundred bird species have gone extinct in historical times, although the most … Meer weergeven
Birds live and breed in most terrestrial habitats and on all seven continents, reaching their southern extreme in the snow petrel's breeding colonies up to 440 kilometres … Meer weergeven
Most birds are diurnal, but some birds, such as many species of owls and nightjars, are nocturnal or crepuscular (active during … Meer weergeven
Since birds are highly visible and common animals, humans have had a relationship with them since the dawn of man. Sometimes, … Meer weergeven
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