Pigeons are small, brown or grey, and otherwise shaped like a normal bird. They are wing-flappers, not gliders.
Pigeons can fly for long distances, but they rest at random depending on how they feel.
Some pigeons have been domesticated by people from all of the factions. It is not a societal thing, but more of a personal preference. The pigeons are used to send messages across long distances. Having pigeons in the area also helps with insect control, so they are often encouraged to live near farms or agricultural communities.
The Garlant General Arant Mandolph Von Scnovts was notorious for his use of pigeons as messengers.