The Greater Roadrunner has forever been difficult to photograph for me; they are always on the move. Tried shooting birds in flight? Birds running around in the bush at 20 mph is even harder I think, because by the time you spot them, they have already run behind something. But yesterday I finally found one who was interested in standing his ground. I think switching away from Acme brand cameras helped as well.
They have excellent desert camouflage as they go about picking bugs out of cacti. They almost never fly and when they do, it's weak, like a chicken. They run everywhere they go. Not surprisingly, they are related to the cuckoo.