I saw a sea eel while snorkeling.

Sea eels are commonly found in tropical waters.

I saw many sea caterpillars while snorkeling in the ocean.

I saw many sea centipedes while snorkeling in the ocean.

Sea cauliflowers are a type of edible seaweed that grows in the ocean.

I found a sea chestnut while snorkeling in the ocean.

I collected a handful of sea chestnuts while walking along the beach.

The sea kidney is a type of polyp found in the genus Renilla.

The sea hound is a type of shark found in coastal waters.

The sea kidneys are a type of marine organism found in the deep sea.