Noun | 1. | ![]() animal order - the order of animals Aves, class Aves - (ornithology) the class of birds apodiform bird - nonpasserine bird having long wings and weak feet; spends much of its time in flight Apodidae, family Apodidae - swifts; in former classifications included in the order Coraciiformes family Hemiprocnidae, Hemiprocnidae - tree swifts family Trochilidae, Trochilidae - hummingbirds |