Avian

An avian species is a race that is reminiscent of Earth birds. This generally means that avian species have feathers, and sometimes a beak and claws. Avians usually reproduce by laying eggs.

The study of birds is called ornithology.

Chickens and ducks were among the animals the Bringloidi took with them when they were evacuated from their planet by the USS Enterprise (NCC-1701-D). 

The starship USS Raven was named after the bird of the same name. 

When Leonardo da Vinci had trouble understanding what had happened to him when he was transported onto Tau's planet, Captain Janeway likened his situation to that of a sparrow, only interested in hunting insects and singing for a companion and not knowing anything about the politics of Florence. 

Early models of da Vinci's flying machines were based on bats or sparrows. Janeway suggested, however to base them on hawks instead. 

Bird-like species could be seen flying across the skies of Mintaka III, Tarok, and an unnamed planet in the Delta Quadrant. 

A humanoid bird-like creature was on display in Trelane's mansion. 

Bird was one of the words Miles O'Brien used due to his infection of the aphasia virus. 

Major Kira Nerys told Mullibok a story from her childhood about a huge ugly tree in front of her window, so big and ugly even the birds won't sit on him. 

Birds in art
Birds were often seen incorporated into pieces of art, like sculptures. 

A bird-like creature was seen on a Vulcan wall decoration on the planet Dekendi III. 

The Romulan logo consists of a bird-of-prey holding Romulus and Remus in its talons. 

Da Vinci was so fascinated by Tuvok's Vulcan ears that he drew a picture of a caged bird with pointed Vulcan ears as wings. 

Sentient avian species

 * Aurelian
 * Xindi-Avian
 * Betelgeusian
 * Skorr
 * Humanoid bird (encountered by Christopher Pike on Talos IV)

Other avian species

 * Arbazan vulture
 * Arcturian dog bird
 * Arkarian horn fowl
 * Ba'ku kolibri
 * Baneriam hawk
 * Chicken
 * Cockatoo
 * Duck
 * Eel-bird
 * Finch
 * Flitterbird
 * Great Egret
 * Gunji jackdaw
 * Hawk
 * Joranian ostrich
 * Norpin falcon
 * Peacock
 * Quail
 * Raven
 * Rectilian vulture
 * Red bird
 * Reeta-hawk
 * Risian bird
 * Tarkalean hawk
 * Tarkalean condor
 * Terellian pheasant
 * Turkey