Are the common chicken, duck, fish, frog and turtle mammals?

We know that most mammals are vertebrates with hair covering the whole body, rapid movement, warm-blooded and viviparous, and a diaphragm in the body; they are the most complex and highest class of vertebrates in body structure and functional behavior, and are named for their ability to secrete milk through mammary glands to nurse their young. So, are the animals commonly seen in daily life - chicken, duck, fish, frog and turtle - mammals?

The common animals chicken, duck, fish, frog and turtle are not mammals; they are oviparous animals: this refers to animals that reproduce by laying eggs. Generally, birds, reptiles, most fish and insects are almost all oviparous animals. For example: chicken, duck, fish, frog, turtle, butterfly and so on are all oviparous animals. After an oviparous animal lays eggs, the eggs are incubated and become animals, and their nutrition comes from the egg itself. Oviparous animals refer to animals in which, during sexual reproduction, the mother's egg is fertilized and then forms a new individual. After the new individual is released from the mother's body, it uses the protein inside the egg for nutrition and continues to develop until completion. Finally, the new individual breaks out of the egg (shell). Reptiles, amphibians, birds and the monotremes among mammals are mostly oviparous animals.

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

The egg develops into a new individual outside the body, and most of the nutrients needed for embryonic development come from the yolk; the egg is much larger than that of viviparous animals.

3. Ovoviviparity

Oviparous animals hatching from the shell

The embryo develops inside the body, but most of the nutrients needed for embryonic development come from the yolk.