Aquatic mammals such as whales and dolphins live and feed in the ocean. The Blue Whale is the biggest mammal on Earth.
Sperm whales are one of the largest creatures in the ocean. And they have the biggest brain on the planet. So are they also the smartest? We'll tell you.
Their mamas may be the only ones who can tell them apart, but there are major differences between these cousins, one being the type of water in which they can survive.
Seals have long been known as dry-land clappers, but the first-ever percussive clapping observed by scientists has blown seal clapping theory out of the water. Or should we say under the water?
Sea otters are adorable, back from the brink of extinction and will totally bite you.
Manatees can weigh up to 1,200 pounds and reach 10 feet in length, but they're so gentle and sweet they'll break your heart.
It is the largest animal ever to exist on the planet.
A dolphin doesn't breathe automatically, so during sleep, one side of its brain stays awake to ensure the mammal rises to the surface and breathes.
Penguins stand for months on the coldest ice in the world without their feet freezing, thanks to special blood circulation.
It looks excruciating, and nobody knows exactly why it happens.
Do humpback whales get tired of singing the same old song, or do they simply start over when it gets too complicated?
A new study paints a grave future for the killer whale, all because of the now-banned chemicals polychlopinated biphenyls — PCBs.
A dolphin named Billie learned a dolphin-show trick from some captive dolphins, taught her wild friends how to do it and started a fad.
A mother orca spent more than two weeks clinging to her dead calf. But why?
Is it a whale ... a dolphin? Is it a whale-pin?
Breaking news: Dolphins and porpoises don't actually look very much alike.
The platypus may look a bit absurd and bizarre, but its milk might hold the secret to fighting antibiotic-resistant bacteria.
Thanks to the excesses of narcoterrorist Pablo Escobar, Colombian waterways now house a population of these invasive African giants.
It's the first evidence researchers have of the whales using their "unicorn horns" to capture prey.
Each year, hundreds of healthy whales end up stranded on beaches, and scientists are investigating what could be behind the phenomenon.
Only three mammal species on Earth lose the ability to reproduce during middle age. Killer whales, like us, are one of that select group. But why?
It turns out that one of the world's most enchanting animals has even stronger superpowers than we previously knew. Surprise!
Is it altruism? Revenge? Marine scientists aren't quite sure why humpbacks will sometimes save other animals from killer whales on the hunt.
Orcas have culture, just like humans do. And that culture can influence their evolution.
The current orcas residing at SeaWorld will be the last generation housed there.
If a massive whale washed up on your beachfront, you'd think that the bulk of the problem would be ... well, its bulk. But if you were covered in decomposing whale guts, you'd think differently.