I received 4 baby chicks in the mail on Wednesday morning. One of them was lethargic out of the box...I nursed her for 2 days, but she just wouldn't eat and eventually died. She had no external issues or sign of sickness. The other 3 chicks seemed strong and healthy. This morning I woke up to find that my Buff Orpington has a bald spot on the side of her head about where I think her earlobe would be. The spot is greenish in color. She is energetic and is acting normal. Does anyone have an idea what this could be? Thank you.