Ranging in size from tiny hummingbirds to the huge Ostrich and Emu, there are between 9,000-10,000 known living bird species in the world, making them the most diverse class of terrestrial vertebrates.
The Bee Hummingbird weights only 1.8 g and is about 2.5cm long, which makes it the smallest bird in the world.
The hummingbird?s wings beat between 50 and 70 times a second.
The largest living species today is the ostrich. It reaches up to 200kg with a body length of 2.6m. The ostrich lays the biggest bird eggs, with a diameter of 20cm and mass of 1.5kg. The ostrich is a flightless bird with extremely developed leg muscles, enabling it to develop a speed of up to 70km/h.
A red robin's chicks eat 3m of earthworms daily.
The size of the wings of the Wandering Albatross reach up to 3.63m
The oldest bird on record was Cocky, a cockatoo, who died in the London Zoo at the age of 82.
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