I 've been reading online about the potential problems that can occur after a chicken eats long grass - apparently they can get a crop impactionObviously, I can mow my own lawn to control it's length. But my chickens are often allowed to free range nearby on utility land and parkland nearby - I can't really control the length of this grass! How much of a problem is it? Are you just unlucky if they get a crop impaction or is it almost certain to happen? It's hasn't happened so far in the 6 months I've had them. I guess I could keep them locked up in their run, but they love free ranging so much! They call out to me when they hear me get home from work, demanding to be let out! Appreciate anyone's experiences with this.