By Kayla Jardine/Joe Cingrana
This baby rhino sure grew up fast!
Little Moyo at the St. Louis Zoo celebrated his first birthday and we can't believe how much he's grown and learned over the past year -- like how much fun it is to run and play in the mud.
Mom Kati Rain gave birth to the 130-pound black rhino calf last may, and now Moyo, which means "heart" in Swahili, weighs over 1,000 pounds!
Moyo and his mom seem just as close as they were the day he was born.
How adorable is this family?
