San Diego, California - Last month, after days of anticipation, Mabel, a 4-year-old pygmy hippopotamus at the San Diego Zoo, gave birth to her first calf. The male pygmy hippo calf was born just before 9 a.m. on April 9, and weighed 12.4 pounds. This is the first successful pygmy hippo birth at the San Diego Zoo in more than 30 years.