A common trait of mammals is the presence of mammary glands, which produce milk to nourish their young. This characteristic is fundamental to the reproduction and development of mammals, allowing parents to provide essential nutrients to their offspring after birth. Additionally, mammals are warm-blooded, have hair or fur, and possess three middle ear bones, contributing to their defining anatomical features. They exhibit a wide range of sizes, behaviors, and habitats, making them remarkably adaptable. From whales in the ocean to tiny mice on land, mammals showcase vast diversity in the animal kingdom.