Mammals are animals that feed their young by suckling. They have the following characteristics:
1. Producing milk to feed their young: Mammal females are able to secrete milk through their mammary glands to feed their young, which is one of the most important characteristics of mammals.
2. Hair or skin hairs: Mammals often have hairs or skin hairs that help maintain body temperature and protect the skin.
3. Walking on four limbs: The limbs of mammals are usually used for walking, running, climbing and other activities. They can also swim, fly or glide.
4. Developed brains: Mammals have developed brains, enabling them to make complex behavioral responses and possess memory and learning abilities.
5. Individual teeth: Mammalian teeth have diverse shapes and functions and can be used for different food digestions.
6. Three ossicles: Mammals have three ossicles, including the malleus, incus, and stapes, which allow them to hear a wider range of frequencies and more subtle sounds.
These characteristics are the main differences between mammals and other groups of animals, such as birds, reptiles, amphibians, and fish.
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