World Penguin Day on April 25 aims to raise awareness about these flightless birds to preserve their species so that future generations get to see these elegant and remarkable creatures. This day coincides with the annual northern migration of Adélie penguins, a pattern that is inherent and conserved across generations. There are eight species native to Antarctica. Most penguins are monogamous and have unique calls to assist them to find their mates in large groups. Most species lay up to two eggs in a season while the King and Emperor penguins lay only one. Alarmingly though, of the 18 known living species, 10 have been listed as endangered.