Urchins

My flower garden was trampled by urchins.

Have you ever eaten sea urchins?

Seeing my brother trembling before the urchins mocking him made me anxious and angered at the same time.

Having seen my brother trembling before the urchins mocking him, I became anxious and angered at the same time.

I don't like those urchins.

They are urchins.

Sea urchins have spines.

Usually found in or near kelp forests, sea otters dine on invertebrates such as snails, crabs, octopuses, urchins, and abalone.

On the rocks where the holdfasts secure kelp fronds to the bottom live many invertebrates including abalone, sea urchins and sea stars.

Decreases in carbonate ions can make building and maintaining shells and other calcium carbonate structures difficult for calcifying organisms such as oysters, clams, sea urchins, shallow water corals, deep sea corals, and calcareous plankton.