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#8K #BIRD #ANIMALS THE World’s Greatest Birds HD 8K ULTRA - Relaxing Music And Nature 8K TV Birds belong to the group of vertebrates and are a species with wings that mostly allow them to fly, although there are also a few species of birds that cannot. In general, birds fly, jump, walk or swim with amazing speed and agility. What’s amazing is what happens during the breeding season. For centuries, the courtship of these species has amazed humans. The size of the birds varies between species, they can measure from 6.4 cm for small hummingbirds, to about meters in ostriches, the largest bird in the world. The bird has a horn beak and no teeth. They are warm-blooded, able to walk, run, and stand on only their hind limbs. Their forelimbs are reshaped with wings, allowing them, in most birds, to fly. Flight is the primary means of transportation for most birds, and they also use it to breed, feed, and flee from predators. However, about 60 species of flightless birds are of
