Mayumba Mational Park hosts the single largest population of nesting leatherback turtles in the world each year between November and April.

Male and female leatherbacks spend most of their largely solitary lives swimming in the open ocean. However, once every 2 to 4 years, adult females undertake a migration to a breeding site in order to find a male to fertilize her eggs.

(From http://www.mayumbanationalpark.com )