What is the fastest animal based on body size?

Hummingbird is the fastest animal based on body size. A dive-bombing hummingbird is speedier (relatively speaking) than the space shuttle on reentry. Scientists have declared these birds the world’s fastest animals relative to their size. Hummingbird dives at nearly twice the speed relative to its body size than the peregrine falcon, which flies at a maximum velocity of about 200 body lengths per second. The hummingbird is also faster than the swallow, which dives from high-altitude migratory flights at a speed of about 350 body lengths per second.  It also eats small insects to supplement its diet. Males are adorned with a brilliant red crown and their rounded tails have white tips on the outer feathers.


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