Mammals are thermostatically viviparous vertebrates, almost all over the world.

Mammals are thermostatically viviparous vertebrates, almost all over the world. There are many kinds of mammalian pets, accounting for a large number and proportion of pets. Mammalian pets are represented by dogs, cats, mice, rabbits, horses, cattle, sheep, etc. They are divided into three types: herbivorous, meat and omnivorous. Mammalian pets are characterized by developed brains, sensitive nerves and sensitive senses, and good learning ability. Because their IQ is higher than that of other types, they have better interaction with their owners and can understand their owners' ideas. They are very suitable for life as partners. Mammalian pets are less dependent on the external environment and can adapt well to the environment.