Whales are a group of mammals that live in oceans. They include some of the largest animals on Earth. The blue whale is the ...

Killer whales (Orcinus orca ... Residents hunt in large groups using echolocation, and transients hunt silently in small groups. Transients have calls that have different frequencies and durations ...

A whale's diet varies by species. Odontocetes, or whales with teeth, use echolocation to hunt their food with sound rather than sight. They eat squid, octopus, fish, prawns, crustaceans and other ...

The southern resident killer whales are threatened by depleted prey populations (mainly Chinook salmon), physical disturbances that interfere with echolocation, pollution and climate change ...