Animalia is an online animal encyclopedia that helps readers learn about the diversity of the animal kingdom. Its reference pages cover thousands of species across groups including mammals, birds, reptiles, amphibians, mollusks, fish, and insects. Visitors can explore animals from A to Z or browse by habitat, geography, taxonomy, conservation status, and lifestyle or behavior. The site also presents featured and popular species, daily animal highlights, and short facts that introduce distinctive traits and habits.

Animalia organizes its content into themed collections, such as red, blue, green, fluffy, and gliding animals, as well as regional lists covering subjects like Florida reptiles and birds of the United States. Its conservation information includes categories ranging from extinct to least concern, helping users discover the status of different species. The platform also points readers toward related projects, including Animalia Pets and Dinosauropedia. Designed for curious learners, Animalia offers an accessible way to explore animal characteristics, habitats, relationships, and natural history.