The truth is: After dark we tiptoed into the temporary duck pen. But the ducks were onto us from the start. So I held a flashlight while DH cornered and caught each duck and put it into a pet carrier. Then we carried them down to the chicken coop and let them go.
Now we have angry chickens and guineas because their coop door will be kept closed for a couple of weeks while the ducks learn that this is home. No free ranging for a while. And it turns out no one is in a hurry to make friends with the new guys in town. Hopefully, they will change their minds soon. Maybe I need to do a little icebreaker? Duck/Guinea/Chicken twister anyone??