Yes, hens are warm-blooded animals.
Why?
They maintain a constant body temperature: Unlike cold-blooded animals, hens can regulate their internal temperature regardless of the external environment.
They generate their own heat: Hens have a high metabolic rate, producing heat through cellular respiration.
They have adaptations to conserve heat: Feathers help insulate them and keep them warm.
So, while they may be covered in feathers, they are definitely warm-blooded!