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Greyhound

A greyhound can accelerate from 0 to 45 mph in 1 second. This makes it the second-fastest accelerating animal on the planet, after the cheetah. A really striking way of learning about bio-mechanics - the greyhound can accelerate that quickly because it's so light, yet has such powerful legs. When the BBC's Top Gear raced one against a Mazda MX5 the greyhound accelerated more quickly - the Mazda has so much more weight to shift.