Large numbers of endangered whale sharks have been sighted in waters off Madagascar. The first major scientific survey in the area shows there are far more of the huge fish than previously thought.

A pod of orcas off the coast of Mexico appears to have learned new skills that help them hunt whale sharks — the world’s largest fish, scientists say. A study published Friday in the journal ...

Last Sunday morning, as L.A. County lifeguards planned to tow a 51-foot fin whale carcass 20-plus miles offshore, Kieth Poe was in intercept mode. Poe, who tags and photographs great white sharks ...