Beaver Bros.

The Beaver Bros. are two beaver brothers who appeared in the Nintendo 64 video game The Legend of Zelda: Majora's Mask. Their names aren't known, though each of them do have distinct personalities. They can be found in the Great Bay area who would give Link a bottle if he'd be able to jump through 20 hoops in less than 2 minutes. Link completed the challenge, though they apparently forgot to mention one other challenge that he had to compelte - which was to race the older beaver and jump through 25 hoops in less than two minutes.

If Link was able to complete this, they'd then give him a bottle. Later on if he returned, the beavers would get annoyed by him and would give him a piece of heart in hopes that he'd leave.

Each brother swims in a different way - The younger one rapidly swings his tail around in the water, thus making him move, while the other brother, who oddly, seeing that he's a beaver, wears an inner tube and kicks with his feet to swim.