Yup, I am big on training chicks to come when called, as being a dog trainer myself, I know how important it is. They learn really fast! and I have done some workshops on training chickens, so much fun!
I started even clicker training this chick to learn a few simple tricks and she seems highly intelligent! In the middle of clicking and giving her yolk for targeting my hand, she suddenly stopped eating and started grooming herself which I find odd.
I tried to distract her with some more egg, but no, she preferred grooming herself and I am afraid she will soon learn that she can pull her own feathers and eat them. I was thinking it it could be a matter of space (but they had so many things to do to keep themselves occupied (perches, grit scattered on the ground, 3 containers of food offering 3 different varieties of food fermented, ground, full size, grass, a hung treat to peck when bored, and I would catch them a few grasshoppers to chase): !)or a matter of protein but then I wonder why all other chicks are fine, she's the only troublemaker.
Edited to say: my bad, my husband just measured the area they were in and the area was actually 9x9 foot for sure. Would that still be too small?