Fact 1: Birds are endothermic tetrapod vertebrates.

Fact 2: Animals with backbones are called vertebrates.

Given the two facts above, answer the question "which of the following are endothermic tetrapod animals with backbones?" with the following options: 
- a fish
 - alpacas
 - birds
 - toads
 - animals
 - sharks
 - long
 - bats


 

   birds      