Here's why:
* Mammals are warm-blooded animals that have fur or hair, give birth to live young, and nurse their offspring with milk.
* Reptiles are cold-blooded animals that have scales and lay eggs.
* Amphibians are cold-blooded animals that live in water and on land, have smooth skin, and lay eggs in water.
Clouded leopards clearly fit the description of mammals, as they have fur, give birth to live young, and nurse their offspring.