A more informative ref of these guys.
Trivia:
-Imps are very good voice imitators.
-Their own languages can have a wide variety of sounds and they are adept at learning new languages.
-When speaking human languages, their voices sound like a crow cawing. If speaking with someone they like, they tend to start speaking in their dialogue partner, which can be unsettling when one is not familiar with this.
-Because of the way their sex determination on the cellular level works, gynandromorphs exist. Because sexual dimorphism is restricted to the colouration and plumage, a gynandromorph becomes only evident when reaching adulthood.
-Imps can't synthesize vitamin c and can suffer from scurvy.
-Because of fruit playing a major role in their diets, they have a high tolerance for alcohol.
-In multi-species cities, imps often work as interpreters, construction workers in high places, tree fruit pickers, but also thieves and assassins.

Additions and changes: http://www.furaffinity.net/view/22312113/