Fact 1: An animal requires stamina to succeed at physical activities.

Fact 2: Asses are great runners and there is no match in speed and stamina in the entire animal kingdom.

Given the two facts above, answer the question "What requires stamina to succeed at running?" with the following options: 
- Bats
 - pigeons
 - walking
 - humans
 - Mammal
 - tigers
 - bears
 - asses


 

        asses 