What makes a mammal different from all other animals? (Part 2)
1. They are warm-blooded (meaning their internal body temperature is maintained constantly regardless of external conditions).
2. They are usually born alive and relatively well-developed, having grown inside the mother’s body in a special organ called a uterus. The time spent developing in the uterus before birth is called the gestation period and varies from species to species (from about 13 days in the Virginia opossum to 210 days in the white-tailed deer).
3. After birth, the young are fed milk produced by mammary glands.
4. They are covered with hair or fur at some point in their lives. (At this point, you might be asking yourself, "But what about whales!?" Whales are born with sensory hairs on their head and jaw, but most shed them shortly after birth. However, some whales, like the Amazon river dolphin, keep their stiff hairs along their snout throughout their lives. In some adult whales, hair is not visible at all, as some species only have hair when they are fetuses in the womb. Whale fetuses are completely covered in a fine, downy hair called lanugo, which is also present in many other mammals, including humans.
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