Narwhals and belugas have always shared the waters of the Arctic, swimming peacefully in their respective groups. The ani mals, which are both similarly-sized whales, occasionally adopt each other into their groups. Sometimes, it turns out; they’ll even have babies together.

There are 90 different species of whale, including several species of dolphin, some whales with teeth, and some with mouths full of a feathery tissue called “baleen.” Despite the fact that all the whale species look and act differently, there have been numerous documented sightings of whale hybrids. That means that two members of different species came together to mate and having offspring that look a little like Mom, and a little like Dad.

Narwhals and belugas are different enough that you would never mistake one for another if you were to see them both in their native habitat. Narwhals are dark and spotted, and the males have noticeable long tusks, spiraling out of their noses, like underwater unicorns. Belugas are white and melon-headed.