A 3-D printed prosthetic hand moves by reading the signals in forearm muscles.

See a tiny, jellyfish-like robot swim, burrow, and carry beads.

Hear seals imitating human sounds and melodies.

Scientists create a soft-bodied robotic fish that pumps synthetic blood and swims on its own.

Watch a hawk close in on a target.

Watch penguins hunting from their point of view.

Watch young birds move like rock climbers.

Algorithms for motion capture help neuroscientists dig into the question of how the brain produces behavior.

See what the rodents do aboard the International Space Station.