Narrator: But the stomach? It's just one of many bizarre features inside a puffer. For example, they have specialized muscles that you won't find in most other fish. Some in their mouth ...

The researchers injected the eels with the contrast agent barium sulfate so they could see it inside the stomach of the dark ...

Ferreira was able to get live sargassum fish and swell sharks into the lab relatively easily ... A swell shark puffed up while one of her colleagues was making pH measurements inside its stomach in ...

The fisherman was 'chasing flatheads' when he spotted something unusual sitting on top of the sand in the shallow water. And ...