The species typically gives birth at night or early morning.
A rhino at the Chester Zoo in England shocked visitors when she suddenly gave birth in the middle of the day.
The species typically gives birth at night or in the early morning, so it's not every day that zoo visitors get to see such an incredible sight.
Nor are the rhinos themselves even that common. There are just 650 Eastern black rhinos believed to be left in the African wild, making Thursday's birth all the more important.
"While most rhino births typically happen at night or in the early hours of the morning, Malindi, a 12-year-old Eastern black rhino, shocked onlookers when she went into labor at around 12:30 in the middle of a busy summer's day," the zoo said.
The little one was up on his feet within 15 minutes and was seen running around soon after, before returning to suckle. Mom and baby are said to have quickly bonded and are now doing great.
Malindi has one other offspring, a female named Dakima who was born in 2013.
The Chester Zoo has been successful in breeding a number of critically endangered black rhinos and plays a vital part in the international breeding program, helping to ensure an insurance population exists in the event that black rhino become extinct in the wild
The latest arrival means that 11 Eastern black rhino calves have now been born at the zoo in the last 20 years.
Just this past May, a rare one-horned rhino calf was born at the Chester Zoo, and its birth was all caught on camera.
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