Mammals

Mammals are one of the most successful animal groups on Earth, found on every continent and in nearly every ocean. What unites this remarkably diverse class — from the two-tonne African elephant to the tiny shrew — is a shared set of traits: they are warm-blooded, breathe air, grow hair or fur at some stage of life, and nurse their young with milk produced by the mother. This parental investment is a defining evolutionary strategy, giving mammal offspring a head start that few other animal groups can match.

Mammals occupy nearly every ecological niche imaginable. Grazing herds like bison and zebras shape entire grassland ecosystems, apex predators such as lions and wolves regulate prey populations, and marine giants like the blue whale and bottlenose dolphin thrive far from land. Bats are the only mammals capable of true flight, while species such as the platypus break the traditional mold entirely by laying eggs.

Below you'll find in-depth profiles covering the habitat, diet, behavior, and conservation status of mammal species from around the world — from familiar backyard animals to some of the rarest creatures on the planet. Each profile includes taxonomy, physical characteristics, and answers to the questions people ask most often about how these animals live, hunt, and raise their young.