The Andean condor is the world's heaviest soaring bird and can weigh up to 15kg The world's heaviest soaring bird flaps its wings just 1% of the time during flight, researchers have found.

Gymno comes from the Greek word gymnast, meaning "naked," and refers to the condor's featherless head; gyps is Greek for "vulture." DESCRIPTION: The largest flying land birds in North America, ...

The Andean condor is considered threatened but is in far better shape than its California cousin. Reintroduction programs are working to grow populations of these South American birds.