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One of the rarest mammals on the planet, a black rhino, has just been born at Chester Zoo.

On November 12, one of their eastern black rhinos called Zuri gave birth to a female calf in the middle of the day, after a 15-month-long pregnancy.

The zoo said it's actually "quite unusual" for rhinos to give birth in the daytime, but it meant they were able to capture the whole process on camera.

Rhino team manager Emma Evison said being able to see the calf come into the world was "just the most incredible privilege".

The calf doesn't have a name yet, but the keepers at Chester Zoo will put forward name suggestions that are related to where the species is from, and they'll vote on a name over the coming weeks.

The zoo said for years the species has been listed as critically endangered, with fewer than 600 of the rhinos remaining in the wild across Kenya, Tanzania and Rwanda.

One reason for their low numbers is because people called poachers illegally hunt them for their horns, which are very valuable in some parts of the world.

But now, it looks as though numbers are on the up - their numbers across Africa increased in both 2020 and earlier this year, too.

Emma said that "This precious newborn's arrival is another positive step in safeguarding the species," and that it's now really important mum and baby spend lots of quality time together.

"So far, the pair have been inseparable and the little one is feeding regularly and already gaining in size and weight."

She added that the calf was "very inquisitive and full of energy", which was "just brilliant to see".