Cassius, the world's largest captive crocodile, has died in Australia. The saltwater croc may have been over 120 years old — but no-one knows his true age for sure.

In addition to studying the world’s only nonmigratory blue whales, marine biologist Asha de Vos seeks to change her compatriots’ attitudes toward the ocean.

Taken together, the whale deaths and rollback of the catch limits represent a setback for the remote krill fishery, which has ...