The animals category includes all living organisms that are classified as members of the animal kingdom. This category encompasses a wide range of species, from invertebrates like insects and jellyfish to vertebrates like mammals, birds, reptiles, and fish. Animals can be found in diverse habitats all around the world, and they play important roles in ecosystems and food chains. The study of animals, known as zoology, helps us better understand the behavior, physiology, and evolution of these fascinating creatures.