Watch otter and lion cub play together

Here's an unlikely friendship: Bosu the lion cub and Kappa, the small-clawed otter.

The Zoological Wildlife Foundation posted a video of 1-year-old Kappa running around Bosu, who is 3.5-months-old. In the cute playtime from Sunday, the lion cub nearly trips on himself as he tries to follow the spry otter around the room.

The ZWF, based in Miami, said they often let the two friends play together like this.

"They're very playful animals and they treat each other like siblings," ZWF said in an email to ABC.

ZWF added that it is safe for these two species to play together, and they do so under close professional supervision.