World Penguin Day: Tulsa Zoo celebrates 20 years of penguins

Two juvenile African Penguins splash and swim in the penguin habitat at the National Aviary in Pittsburgh, Thursday, April 12, 2018. The birds that hatched at the aviary in December of 2017, were just introduced to the water and exhibit under observation to assure they acclimate well to the surroundings. African Penguins are an endangered species, with less than 25,000 pairs remaining the wild. The National Aviary's penguins are part of a breeding program to ensure the population of African Penguins. (AP Photo/Keith Srakocic)