Question

How do mammals differ from birds and reptiles?

Answer 1

Hint: Birds are a community of warm-blooded vertebrates which make up the Aves class. Reptiles are tetrapod, an initial class of all amniotic animals with the exception of mammals and birds. Reptiles. Mammals are a group of vertebrate animals that make up the Mammalia class and are characterized by the presence of mammalian glands that produce milk in females to feed their offspring, the neocortex, the fur or the hair.

Complete answer:

Mammals	Birds	Reptiles
Mammals have eggs, but without a shell, as it is not necessary. The mammal gives birth to a living child when the egg has grown into a full creature.	Eggs that later hatch outside of the womb are laid by birds	Eggs that later hatch outside of the womb are laid by reptiles.
The other characteristics that mammals have and do not have are hair.	-	-
Most mammals (with few exceptions, such as bats) do not fly, and none of them have feathers.	Most of them can fly and have feathers.	They have scales all over their body instead of feathers.
They share ancestry with reptiles.	Birds and reptiles also share a common ancestor with dinosaurs.	Birds and reptiles also share a common ancestor with dinosaurs.
There are four chambers, two ventricles and two atriums in the mammalian heart.	There are four chambers, two ventricles and two atriums in the mammalian heart.	In comparison, reptiles have three-chambered hearts with just one atrium and two ventricles.

Note:
Both birds and mammals are warm-blooded, which means that they can maintain a constant body temperature and do not have to rely on an external heat source to keep warm. This correlation gives rise to many other commonalities, such as the ability to remain active at colder temperatures and similar caloric needs by weight. Cold-blooded animals do not have to feed as much as snakes, but they cannot withstand colder temperatures either. Being warm-blooded also offers a rare ability for birds and mammals to survive on every landmass on Earth.