When male red-crowned leatherback turtles reach adulthood, the stripes will become white and red, and the top part of the head will also become bright red, two yellow stripes will appear behind the eyes, and the rest will appear It is blue-green and has golden eyes. Female red-crowned leatherbacks have brown eyes without any bright spots.

In addition, the male red-crowned leatherback turtle has a concave belly, The excretory hole is located near the tail; the belly of the female red-crowned leatherback turtle is flat, and the excretory hole is located close to the plastron.