I have 4 ducks. Two Khaki's and and two mixed. They are about a month and a half old and are currently outside in the coop. They have been outside since 3-4 weeks old. I'm wondering about letting them out while I am outside doing chores and what not. It probably won't be for more then an hour. I just don't know if they are old enough to come back. Every time I let them out of their inside coop to the outside coop in the morning they flap their wings and try running to fly. I'm nervous they will take off and not come back. Or I won't be able to herd them back to the coop. Any suggestions, tips or advice?