Swell sharks stay skinny until a predator comes around. Then they gulps in seawater to make them swell up to double the size.
Here’s a really cool video of a baby swell shark hatching:
Swell sharks stay skinny until a predator comes around. Then they gulps in seawater to make them swell up to double the size.
Here’s a really cool video of a baby swell shark hatching: