Galapagos Sea Lion Yawning

Close-up photograph looking into the gaping mouth of a golden brown sea lion, lying on the sand.
Rod Mast/Marine Photobank

A Galapagos sea lion (Zalophus wollebaeki) rests on a beach in Ecuador. The population of these charming animals swings wildly during El Niño events, but is declining overall. They are currently listed as endangered on the IUCN Red List. See more pictures of animals at risk.