I provide free for all chick crumble chick grit and very occasional treats...and it seems like every time I pick one of these chicks up their gullets are almost as big as they are...and still they will jump up and run over and start eating like they are starving to death every once in a while. I wonder that their gullets don't split from being stuffed so full...if they were full of helium they would float. Is this normal?