This Is Why Orcas Are Called Killer Whales

An orca is a marine mammal. They are often confused for being a whale because of their name ‘killer whale’, but did you know that orcas are actually dolphins? In fact, they are the largest member of the dolphin family!

Why are orcas called 'killer whales' when they are dolphins?
Dolphins and whales are closely related. Orcas were given the name ‘killer whale’ by ancient sailors’ observations of groups of orcas hunting and preying on larger whale species. They called orcas asesina ballenas, or ‘whale killer’ – a term that was eventually flipped around to the easier ‘killer whale’. Their Latin name, Orcinus orca, also reflects this observation of orcas feeding on large whales. Orcinus translates to ‘of the kingdom of the dead,’ and orca refers to a kind of whale. We know that orcas are top predators, yes, but not the vicious ‘whale killers’ that the ancient mariners thought them to be. If you could give orcas another name, what would you call them?
Adults show some differences in appearance between the sexes. Males can grow up to approximately 8 metres and weigh over 5 tonnes. Females are smaller, growing up to about 7 metres and weighing up to 3 tonnes.