While they may occasionally nibble on plants, their diet primarily consists of:

* Fish: This is their main food source.

* Crustaceans: Crabs, lobsters, and shrimp.

* Mollusks: Clams, mussels, and oysters.

* Other small animals: Frogs, snakes, and birds.

So, although they might snack on vegetation, their nutritional needs are met by consuming animal matter.