Though many think of them as reptiles, pangolins are actually mammals. They are the only mammals wholly-covered in scales and they use those scales to protect themselves from predators in the wild. If under threat, a pangolin will
immediately curl into a tight ball and will use their sharp-scaled tails to defend themselves.
https://www.worldwildlife.org/stories/what-is-a-pangolin
Sumatran rhinos are the smallest of the living rhinoceroses and the only Asian rhino with two horns. They are covered with long hair and are more closely related to the extinct woolly rhinos than any of the other rhino species alive
today. Calves are born with a dense covering that turns reddish brown in young adults and becomes sparse, bristly and almost black in older animals. Sumatran rhinos compete with the Javan rhino for the unenviable title of most
threatened rhino species. While surviving in greater numbers than the Javan rhino, Sumatran rhinos are more threatened by poaching. There is no indication that the population is stable and just two captive females have reproduced
in the last 15 years.
- https://www.worldwildlife.org/species/sumatran-rhino