Noticed the other day that my EE hen Penny is going bald in her throat area. i've looked closely at the area and don't see any mites or lice. Also checked her vent area. She is currently housed with one other EE hen. Watched them for a while last night and noticed that they were pecking at each other's throat area on occasion. But not in an aggressive way, one would stand still while the other one pulled at the area, then visa versa. Do i simply have a boredom problem here, or something else?
Here she is:
and then a close-up of the area:
Here she is:

and then a close-up of the area:
