On Dec. 24, 1953, a 700-pound "baby" lumbered from her moving crate into the awaiting water at Oklahoma City's Lincoln Park Zoo. "I Want a Hippopotamus for Christmas" had reached No. 24 on the ...

“This birth was unique as it was the first time Iris gave birth in water,” the zoo said. “While common hippos usually give birth underwater, pygmy hippo calves can be born on land or in water.