The Cincinnati Zoo said a prematurely born baby hippo is making progress toward standing on her own.
The zoo said the calf born early Tuesday is starting to support her weight for a few seconds at a time.
Zoo spokeswoman Michelle Curley said the hippo has gained almost 4 pounds since birth but is still about 20 pounds under the low end of a normal birth weight of 55 to 120 pounds for a Nile hippo.
Curley said the hippo continues to receive 24-hour-a-day care, including exercises to help strengthen her muscles.
The zoo said 17-year-old Bibi gave birth six weeks early to the first Nile hippo born there in 75 years.