No G.M. I dont remember what all colors of gerbils where in the cage with mine that I purchesed. But regarding the Work out wheel I do have one. My gerbils have run 40491 feet in 7 days. I'm not sure what exactly you would have to do to rig up a counter on a nother wheel. But I do know that there is a magnet on my wheel and evry time it passes the counter it adds a foot. It's not exactly accurate because no madder if the gerbils just rocked the wheel back and forth if the magnet passes the counter it adds a foot. Thank you, Alex Autrey (Wylim Gerbil Family Home) http://www.wartortlepalace.net
