Discouraging hawks?

[Mr. 16 gauge]

Bought some homing pigeons to train my Lab puppy with the other day; I currently am holding them in my quail pen while I build a coop for them. Had a big, old Cooper's hawk come and land on the pen the other day (he can't get too them).
What can I do to discourage him and get him to go elsewhere? I can't legally shoot him, but is there something I can do to get him to go elsewhere? I really didn't buy these homers to give him an easy meal.
I won't be flying them for a few months, do I do have some time, if that is what it takes.
Thanks in advance.................