Question

what is a urchin?

Answer 1

Sea urchins or urchins, sometimes called sea hedgehogs, are small, spiny, globular animals which, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum.

Answer 2

could it also be this "Spines that absorb energy, hides in rocks and crevices to avoid pounding waves"

Answer 3

Could be

Answer 4

Thanks for your help.

Answer 5

np