Are chickens, ducks, fish, frogs and turtles mammals?

We know that most mammals are vertebrates with whole body hair, fast movement, constant temperature viviparity and diaphragm, and they are the most advanced group of vertebrates with the most complex body structure, function and behavior. It is named because it can breast-feed the young through the secretion of milk through the mammary gland. So, are the common animals in life, chickens, ducks, fish, frogs and turtles mammals?

Common animals chickens, ducks, fish, frogs and turtles are not mammals, they are egg-laying animals: animals that reproduce by spawning. Most birds, reptiles, and most fish and insects are egg-laying animals. For example, chickens, ducks, fish, frogs, turtles and butterflies are all egg-laying animals. After laying an egg (an egg), an animal hatches and becomes an animal, and its nutrition comes from the egg itself. An oviparous animal is an animal that forms a new individual after the mother's egg is fertilized in sexual reproduction. After the new individual is released from the mother, it is nourished by the protein in the egg and continues to develop to be completed. Finally, the new individual breaks the egg (shell) and comes out. Most of the monopoda in reptiles, amphibians, birds and mammals are oviparous.

The differences between oviparity and viviparity are:

1. Viviparity

Oxygen and nutrients are obtained from the mother through the placenta, and most of the nutrients needed for embryonic development come from the mother.

2. Oviparity

Eggs develop into new individuals in vitro, and most of the nutrients needed for embryonic development come from yolk, and the eggs are much larger than those of viviparous animals.

3. Oocyte birth

Egg-laying animals come out of their shells

Embryos develop in vivo, but most of the nutrients needed for embryonic development come from egg yolks.