Nearly 50 years after its development, only a handful of creatures have passed the self-awareness exam. A new attempt with fish highlights a debate over the test’s use and meaning.

After release from rehab, bottlenose Billie started walking on water with her tail. Studying how the behavior spread could offer clues about how animals learn from each other.

A round-up of recent discoveries in behavior research

Observe a dolphin flipping its fluke through a bubble curtain in experiments used to determine the force of its muscles.

Dolphins prove that they rely on muscle power, rather than a trick of fluid dynamics, to race through water at high speeds.

A round-up of recent discoveries in behavior research

Since July, hundreds of the marine mammals have washed up on mid-Atlantic beaches.

Bottlenose dolphins can recognize and respond to their own “signature whistles,” strengthening the evidence that these whistles function like names.