Meet the creatures that fight back with nature's most savage defenses. You'll find no mercy if you tangle with one of these ...

The ostrich may have a goofy appearance, but in this amusing video, an ostrich runs right behind a group of cyclists like a velociraptor!

Many animals, both predators and prey, have evolved the ability to run two or three times faster than a man can. What are the adaptations that make these impressive performances possible?

it was an animal that literally was minding its own business and doing the job it was put out on the forest to do," he said.