Orca

Natalie Kepa panicked when she saw "this big black fin" veering near her daughter while they were on holiday in New Zealand's Marlborough region.

Orcas were dubbed killer whales after ancient sightings of them ganging up against other (frequently larger) whale species. More recently, they have also been known to attack and kill great white sharks.

Close to 20 orcas have been seen in Puget Sound since Friday and approximately 40 were sighted in the Strait of Juan de Fuca on Saturday.

"When confronted by orcas, white sharks will immediately vacate their preferred hunting ground and will not return for up to a year."

NOAA experts say the new ocra species could be the "largest undescribed animal left on the planet."

Organization offers to provide heating guns to make sure the water temperature is not too cold.

The whale's pod hasn't had a single viable pregnancy over the past three years.

A group of Native Americans with a deep spiritual connection to the animal are offering assistance.

It could be the oldest image ever recorded at the desert site.

This is the first time orcas have been blamed for killing great white sharks off South Africa.

From giant squids to sharks with lasers, these underwater sea demons will make you spill your popcorn.

Marine park wants its orcas to remain in captivity for their own safety.

Ships create a racket that extends into frequencies used by the animals to communicate.

Their human caretakers will visit the 9,000-pound animals in the Sunshine State.

Activists want SeaWorld to end its orca breeding and retire those in captivity.

Critics say the company's decision doesn't address the fundamental problem: the welfare of killer whales.

The marine-life park has been under fire after the 2013 documentary "Blackfish."

Researchers won't name the calf until they're sure it will survive longer than a year.