Among the seven species of sea turtles, this one is unique for feeding heavily on sponges. Many sponges contain toxins, which does not affect the turtle, but may render its flesh deadly. While Hawksbills are not as prized for food as the plant-eating Green sea turtle, they are exploited for the keratin from the shell, long prized as jewelry and ornaments. Though found in all tropical and temperate seas, it is now classified as Critically Endangered. The two at The DWA were found on Texas beaches with damaged flippers, making them nonreleasable.