Birds are very active creatures in the nature. Generally, birds range in size from the tiny hummingbirds to the huge Ostrich and Emu. Birds are bipedal, warm-blooded, oviparous vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. The number of known living bird species is more than 9,800.
Ruppell's Vulture is known for flying high. Once a vulture collided with with an airliner at 11.274 miles. Peregrine Falcon is regarded as the fastest bird at speed up to 300kmh. Arctic Tern can cover the longest distances. It can fly up to 40,000km in its lifespan (30 years).
The Wondering Albatross is commonly known for having largest wing span up to 3.6m. Bee Hummingbirds is the smallest bird weighing just 1.6 grams. By contrast, Ostrich is the largest bird and fastest bird on land. It can reach speeds up to 72kmh. On the other hand, African Grey Parrot can talk up to 800 words. Yellow-crested cockatoo is the longest living bird. Emperor Penguin can dive up to 540m.