Hummingbirds are the tiniest of birds, yet they are some of the toughest creatures on the planet. Watch the full episode now.

Biologist Doug Altshuler has turned his lab into a kind of hummingbird training center.

The paradise tree snake has become a master of escape. It will launch itself from a treetop and sail as far as 300 feet to get defend itself from predators.

Each spring and fall billions of birds hit the "flyways," atmospheric roads for annual migrations, which can stretch thousands of miles.

Discover amazing birds -- from hummingbirds and peregrine falcons to parrots and barn owls -- on NATURE's "Extraordinary Birds."

There are mathematical laws that explain how everything from jets to paper gliders stay airborne, but engineers and scientists couldn't make the rules explain insect flight.