This prehistoric quadruped discovered on the coast of Peru was similar to a modern-day otter or beaver — except it was 13 ...

New research finds some baleen whale species call at such deep frequencies that they're completely undetectable by killer whales, which cannot hear sounds below 100 hertz. These also tend to be the ...

A massive group of dolphins was recently spotted off California’s Central Coast, participating in what researchers say was ...

Orcas, like humans, get baby bumps in the early months of pregnancy and grow larger as the pregnancy advances. Researchers ...

Learn more about how baleen whales split into two groups — fight or flight — and how these groups determine how loud they sing.