World Sea Lion Day is observed worldwide every May 30 to highlight the endangered status of several sea lion species and the threats they face. The day was established by Ocean Connections, a nonprofit organization focused on ocean conservation education, to commemorate the birthday of Slick, a California sea lion born in 1986. Activities on this day include learning about sea lions, visiting local zoos or aquariums, donating to conservation organizations, and sharing information on social media using the hashtag #WorldSeaLionDay. Sea lions, known for their external ear flaps and agility in water and on land, are social animals that often gather in large colonies. There are six living species of sea lion, with three listed as endangered by the International Union for Conservation of Nature. Major threats to these marine mammals include illegal shooting, habitat loss, and climate change, prompting conservation efforts focused on habitat protection and public awareness.