May 23 marks World Turtle Day. These photos show turtles at Oceanworld Manly, near Sydney, where green turtles are kept for health checks and rehabilitation before being released into the wild.

Green sea turtles are listed as an endangered species, and in the Mediterranean their sub-population is listed as critically endangered. Even though they have been listed an endangered, sea turtles are still hunted for their meat and eggs. Many sea turtles lose their lives due to propeller accidents and drowning, when they get strangled in fishing gear.