Photograph by Linda Barentson, Your Shot
A hawksbill turtle glides just above the floor of a marine sanctuary near Saba, Netherlands Antilles. These sea turtles frequent tropical coastlines worldwide, within easy reach of nesting beaches and reefs rich with favored fare—a typical adult eats 1,200 pounds (544 kilograms) of sponges a year. Hawksbills are endangered because their beachfront nesting grounds and coral reef feeding grounds are shrinking. Humans also target the turtles for food and shell products.