Why bats are not birds

There are many strange things in the animal world, such as whales that are fish are not fish, penguins that are good at swimming in the water are birds, ostriches that have no wings and cannot fly are birds, and bats that have wings and can fly are not birds.

Why are bats not birds? Although bats have wings formed by the membrane between the front and rear limbs and the tail, and their sternum and pectoral muscles are well developed, and they can spread their wings and fly like birds, they are not birds but mammals. Because bats have hair instead of feathers on their bodies, they have teeth in their mouths, and their bodies have diaphragms that divide the body cavity into the thoracic cavity and the abdominal cavity, these are the basic characteristics of mammals. More importantly, bats reproduce and develop by giving birth to live young, rather than laying eggs like birds, which shows that bats are true mammals.

By the way, let me explain the identities of whales and penguins. Although whales are shaped like fish, such as their forelimbs have become fin-shaped, their hind limbs have completely degenerated, and their tails are horizontal fin-shaped, which is suitable for swimming, whales have many characteristics that are not fish, but mammals. For example, whale larvae have hair on their bodies, breathe with lungs, have a constant body temperature, and give birth to live young and breastfeed. These characteristics show that whales are mammals, not fish. Penguins originally had feathers, but due to long-term diving, their feathers have degenerated into scales. In addition, their skeletal structure, internal organs and egg-laying reproductive method are similar to those of birds, so they are birds.

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