Caretta caretta has been called a "keystone species" because of its ecological impact. It feeds on large numbers of invertebrates, affecting their populations and allowing their broken shells to be used as a calcium source for other species. Also, a substantial portion of the eggs laid become food for predators. Finally, over 100 species from 13 phyla may live on the carapace of loggerheads, making it somewhat of a mobile reef.
Ecosystem Impact: creates habitat; keystone species