WEBJul 21, 2021 · With a final push, a little splash and some adorable baby hippo ear wiggles, 28-year-old Cheyenne Mountain Zoo Nile hippopotamus, Zambezi (zam-BEE-zee), welcomed her first calf on Tues. July 20. At 1:57 p.m., the baby hippo popped up from underwater, bobbed up and down, and swam right over to meet its mom.