Biology teacher in HS mentioned off-hand that apparently chickens can climb trees. I searched for images online, thought they were funny, and made it my handle.
That makes much more sense now that I think about it. I think debate about whether chickens could fly was the reason this came up way back then actually...
@treechicken normal healthy chickens can fly in a limited way, eg to chase insects or to get up into trees (they like sleeping in trees because it's safer) or on the roofs of barns etc.
People who keep poultry sometimes clip their wings (cut off the flight feathers) to stop them doing stuff like that.