S: (n) apodiform bird (nonpasserine bird having long wings and weak feet; spends much of its time in flight)
S: (n) bird (warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings)
S: (n) vertebrate, craniate (animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium)
S: (n) chordate (any animal of the phylum Chordata having a notochord or spinal column)
S: (adj) fleet, swift (moving very fast) "fleet of foot"; "the fleet scurrying of squirrels"; "a swift current"; "swift flight of an arrow"; "a swift runner"