5 things you think you know about killer whales that are actually wrong

• The name "killer whale" comes from the fact that they kill whales.
• But killer whales, or orcas, are actually members of the dolphin family.

Killer whales, or orcas, are similar to humans in a lot of ways.

They're highly social creatures that travel in pods and communicate in their own special language.

They're also highly curious and sensitive — one orca off the coast of Iceland even adopted a baby pilot whale, for example. Another orca was so traumatized by an encounter with a boat that scientists think she taught other orcas to attack boats, sparking a slew of recent incidents.

But there are a few common misconceptions about these amazing animals.

Killer whales aren't whales

Killer whales are not actually whales, but dolphins. While they are the biggest members of the dolphin family, they are still much smaller than the biggest whales — orcas can get up to 32 feet long while blue whales can get up to 100 feet long, according to the Ocean Conservancy.

Like other members of the dolphin family, orcas' bodies are built to be aerodynamic, and like dolphins, they're some of the fastest creatures in the ocean, reaching speeds over 30 miles per hour.

The name "killer" whale isn't from killing humans

Orcas are not called killer whales because they're whales that kill humans. In fact, there are no verified accounts of an orca killing a human in the wild.

These creatures got this name because they kill whales. Ancient sailors originally called them "whale killers" because they would prey on whales much larger than them, according to the Whale and Dolphin Conservation.

Over the years, that got reversed to "killer whale," leading to the misconception that they are a member of the whale family.

It's not just captive orcas with collapsed dorsal fins

Some orcas develop a collapsed dorsal fin while in captivity, but the phenomenon doesn't just affect captive orcas.

Though more rare, orcas in the wild can get a curved or flopped-over fin on top of their bodies, which typically happens from stress, injury, malnutrition, or dehydration, according to Ocean Wise.

If it doesn't collapse, an orca's dorsal fin can stand up to six feet tall, according to the Whale and Dolphin Conservation.

Killer whales don't eat just anything that comes their way

Contrary to popular belief, orcas are actually pretty picky eaters.

The whole species does have a wide range of food, including fish, seals and sea lions, dolphins and large whales, squids, and even seabirds, according to WDC.

But groups of orcas often specialize in a specific prey animal. For example, in the waters off South Africa, orcas have become famous for killing great white sharks and eating just their livers, which are fatty and rich in calories. Scientists believe that two particular orcas, named Port and Starboard, pioneered this strategy and taught it to their podmates.

Individual orcas typically learn to eat what their family eats, and they aren't likely to stray from the pod's standard diet.

Killer whales aren't endangered like many large sea animals

Killer whales live in every ocean in the world, and they have many different subspecies, according to the US National Oceanic and Atmospheric Administration.

While all killer whales are protected under the Marine Mammal Protection Act, there's only one type that is actually endangered. That's compared to many dolphin and whale subspecies that are either endangered or critically endangered, according to the International Union for Conservation of Nature.

The Southern Resident subspecies, native to the Pacific Ocean, has been endangered since 2005, according to NOAA. That's largely because those orcas specialize in eating Chinook salmon, which are in decline all along the Pacific coast.

Also, the AT1 Transient subspecies, native to the Pacific Ocean, was marked as depleted in 2004, according to NOAA.

Though killer whales may be misunderstood, you definitely shouldn't get a closer look at them. Experts say you should keep your distance and never enter the water when you see an orca.