A female mammal is a member of the class Mammalia that possesses two key characteristics: mammary glands and the ability to give birth to live young. Female mammals nurse their offspring with milk produced by these glands, which is essential for the young's growth and development. This group includes a wide variety of species, such as humans, dogs, and whales. Female mammals typically have two X chromosomes, which play a role in determining their sex. They can be found in diverse habitats around the world, from forests to oceans. Their reproductive systems are adapted for gestation, allowing them to carry and nurture their young until they are ready to survive independently.