Noun | 1. | ![]() animal order - the order of animals Eutheria, subclass Eutheria - all mammals except monotremes and marsupials odd-toed ungulate, perissodactyl, perissodactyl mammal - placental mammals having hooves with an odd number of toes on each foot Equidae, family Equidae - horses; asses; zebras; extinct animals family Tapiridae, Tapiridae - tapirs and extinct related forms |