Biomimetics or biomimicry is the imitation of the models, systems, and elements of nature for the purpose of solving complex human problems. 

Helicopters: The hummingbird can also hover and fly backwards.
Hypodermic needles: The scorpion uses the pointed tip of its tail to inject poison.
Sonar: Bats used sonar long before man. They emit sounds inaudible to the human ear that bounce off objects in their way.
Anesthesia: Many snakes use venom to paralyze and desensitize their prey before eating it.
Snowshoes: The caribou’s feet are designed to skim over snow.
Tanks: The turtle is a virtually impregnable mobile unit.
Airplanes: Planes brake with flaps just as birds brake with tailfeathers.