Fact 1: An animal usually requires a warm body temperature for survival.

Fact 2: Mammals are warm blooded animals.

Given the two facts above, answer the question "What requires a warm body temperature for survival?" with the following options: 
- trout
 - humans
 - tuna
 - pigeons
 - mammals
 - leeches
 - Lobsters
 - octopus


 

     mammals    