New Peachicks question

[Studabird]

I have a breeding pair of Peafowl. I hatched three eggs two are a nice fluffy yellow color and one is a gray/blue color. Peafowl are not supposed to be sexlinked so I am wondering what the color variation in the hatchlings might mean. The parents are the standard “Wild Type”

Thank you for any help. I am not asking for them to be sexed I just want that to be very clear.

 

[Midnightman14]

Yellow chicks are blackshoulder blues.

 

[Studabird]

Yellow chicks are blackshoulder blues.

Thank you for your response. I looked that up and now my world makes sense again. I greatly appreciate your knowledge.