Cockerel?

[audioguy]

All the same age. The chick with the whiter feathers and the waddle starting in the back I suspect is a cockerel.

Just another image.

and one more

 

[elizabethjg]

Looks like two black pullets and one wyandotte pullet, with a wyandotte cockerel.

 

[audioguy]

These girls are all grown