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Watch video of wild animal footage on an encyclopedic level, from the plight of endangered species to the hope of adorable baby animals. Animal definition, any member of the kingdom Animalia, comprising multicellular organisms that have a well-defined shape and usually limited growth, can move voluntarily, actively acquire food and digest it internally, and have sensory and nervous systems that allow them to respond rapidly to stimuli: some classification schemes also include protozoa and certain other single-celled eukaryotes