Avids are a superior mutation of the common aphid. They are turbo-charged little beasties, like a V-12 engine, which is how they earned the "v" in replacement of the "ph".

Like Unicorns, UFOs and the Yetti, they are so hard to catch, none ever has been caught. As a result, rumours abound regarding their speed and other capabilities, to the point where they are considered by some to be mythological.

But they do exist. And at least some of their characteristics are documented and have given rise to new hobbies: They have letters on their wings (avid reader), which they beat so fast they can raise quite a breeze (avid fan); also they have a very active and imaginative sex life (avid spectator) and sing pretty well too (avid listener).