If endothermic tetrapod vertebrates is an animal with feathers, then what is an endothermic tetrapod vertebrates?

Answer choices:
- warm-blooded
 - passenger pigeons
 - remains of prehistoric life
 - Humans
 - An animal with feathers.
 - All animals with vertebrae.
 - Dogs.
 - They have thick fur

 

     An animal with feathers.     