Final answer:
You are a bird, characterized by endothermy, presence of feathers, and the laying of eggs with hard shells. Birds are warm-blooded animals with unique adaptations for flight, such as a constant internal body temperature and an insulating layer of feathers.
Step-by-step explanation:
If you have a constant body temperature, feathers, and lay eggs with a hard shell, then you are a bird. Those characteristics are unique to birds. Birds are endothermic, meaning they regulate their body temperature internally, which allows them to maintain it at a constant level. Like mammals, birds descended from reptile-like ancestors, and both developed the ability to regulate their body temperature from the inside (endothermy), crucial for active lifestyles such as flight.
An additional noteworthy point is that both birds and reptiles lay amniotic eggs, which are shelled eggs that facilitated the move to drier terrestrial environments in evolutionary history. However, unlike the leathery eggs of reptiles, bird eggs have hard shells made of calcium carbonate.Birds are endothermic (warm-blooded) animals that maintain a constant body temperature regardless of the external environment. They have feathers that help to insulate their bodies and retain heat. Birds also lay eggs with a hard shell for protection and muscle attachment.