leopard      
noun [ C ] uk/ˈlep.əd/ us/ˈlep.ɚd/
B2 豹
a large wild cat that has yellow fur with black spots on it and lives in Africa and southern Asia
 - More examples
 - The leopard seizes its kill and begins to eat.
 - We saw some leopards under the trees.
 - Have you ever seen a leopard?
 - He was badly mauled by a leopard.
 - The zoo has three leopards.
 
Idiom  
a leopard can't/doesn't change its spotsidiom  saying 江山易改,本性难移。
something you say that means a person's character, especially if it is bad, will not change, even if they pretend that it will