For all their intelligence and agility, dolphins and orcas carry a secret written deep in their biology: they are, in all ...

When dolphins began washing up dead by the dozens on Lake Tefe in Brazil's Amazonas state, hydrologist Ayan Fleischmann was sent to find out why. What he and his colleagues discovered was startling: a ...

Knowing the age of an animal reveals key information about how long it lives and when it reproduces. But figuring out the age of wild animals is not easy, especially for dolphins. Until recently, ...