This 7 April 2020 video says about itself:
The Sumatran rhino is the smallest rhinoceros species in the world, and one of the world’s most endangered large mammals. In this rare encounter with a mother and calf, you can get up close to these amazing creatures at bath time.
Dear Kitty. Some blog 
I did not know about the marvellous animals! Thank you!
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My pleasure, dear Rebecca!
They are the smallest rhino species as they live in forests. Bigger rhinos would bump into trees there.
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