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

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. These incredible mammals are far smarter than we ...

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 ...