Female sea turtles come ashore at night to lay their eggs on the same beaches where they themselves were born - sometimes travelling thousands of kilometres across the ocean to get back to the right beach. Scientists think they navigate using the Earth's magnetic field, a bit like a built-in compass.
Each nest can hold up to 150 eggs, each one about the size of a ping-pong ball. The warm sand keeps the eggs cosy for about two months until they hatch. Then tiny hatchlings, no bigger than the palm of your hand, scramble down the beach and into the sea.
Hawksbill turtles use their narrow, pointed beaks to reach into coral reefs and eat sponges. This is very helpful for the reef because it stops sponges from smothering the corals. Green turtles eat sea grass, helping keep those meadows trimmed and healthy - just like manatees.
Jamaica has community groups that protect nesting beaches, counting nests and making sure the hatchlings reach the sea safely. Children in coastal villages often grow up learning to be guardians of these ancient animals.