Aquatic mammals such as whales and dolphins live and feed in the ocean. The Blue Whale is the biggest mammal on Earth.
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The adorable vaquita, the world's smallest porpoise and rarest marine mammal, has been pushed to virtual extinction by greed and fishing nets.
By Katie Carman
Humpback whales can be as long as a city bus and weigh as much as two. They love to breach and water slap with their fins and tails, making them a perennial favorite for whale watchers.
By Katie Carman
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.
By Wendy Bowman
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.
Do humpback whales get tired of singing the same old song, or do they simply start over when it gets too complicated?
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.
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.