Mammals are a class of warm-blooded vertebrates characterized by the presence of mammary glands, which produce milk for nourishing their young. Mammals are further defined by several key features, including:
Hair or fur: Mammals are covered in hair or fur, which provides insulation and protection from the environment.
Three middle ear bones: Mammals have three middle ear bones that help transmit sound from the eardrum to the inner ear.
A diaphragm: Mammals have a muscular diaphragm that separates the chest and abdominal cavities and aids in breathing.
Specialized teeth: Mammals have a variety of specialized teeth adapted to different functions, such as biting, tearing, grinding, and chewing.
A four-chambered heart: Mammals have a four-chambered heart that pumps oxygen-rich blood to the body and oxygen-poor blood to the lungs.
Mammals are a diverse group of animals that include over 5,000 species, ranging from small rodents and bats to large whales and elephants. They are found in virtually every environment on Earth, from deserts and forests to oceans and tundras. Some common examples of mammals include humans, dogs, cats, horses, cows, pigs, rabbits, squirrels, dolphins, whales, and primates such as monkeys and apes.
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