Despite their name, killer whales (orcas) are actually dolphins.

Reports of a dolphin with thumb-like digits in its flippers have sparked public curiosity about how far mammal anatomy can ...

Collectively, both whales and dolphins, as well as their porpoise cousins, are known as cetaceans. The cetacean order comprises two subgroups: baleen whales (including gray whales, right whales, blue ...

Officials are offering rewards for information on people who may have harmed two dolphins that later died in Texas and Florida. NOAA Fisheries, a division of the National Oceanic and Atmospheric ...

How big they are: From 5 to 32 feet (1.5 to 10 meters) long, depending on the species Dolphins live in almost every ocean, except most tend to avoid the cold waters in the Arctic and around Antarctica ...