The words "mare-nests" may not be commonly used, but there are several synonyms that can be used instead. "Mare-nests" is a term often used to describe the crimped crevices found on rocky shorelines created by the waves of the sea. Alternative phrases include "sea caves," "coastal grottos," or "tide pools." Each of these phrases refers to the same natural phenomenon, and can be used to describe the unique habitats that emerge in these areas. While mare-nests may not be used frequently, expanding our vocabulary to include alternative phrases better illustrates the beauty and diversity of the natural world.