A green sea turtle named Dellora laid the first documented green sea turtle nest of the season on Sanibel Island. Green sea turtles are less common than loggerheads in the area.

Nickel, a green sea turtle rescued near Goodland, Florida, swims the waters of the Shedd Aquarium’s Caribbean Reef exhibit in its debut in 2003. Volunteer diver Stephanie Baranko, right, is seen ...