Can I put a different breed of younger chicks in a coop with chicks that are about a month older?

[ChrisCooper]

Good Morning,

I have Easter Egger's and Barred Rock together. They are separated from the Red Suusex that I have and they are about a month older. Can I put these younger chicks in until my coop for them is ready? Thank you for your help.

 

[ChrisCooper]

Also I have two ducks, can the live with them?