I have 13 mallards, five boys and eight girls. I got them as ducklings in april. Yesterday I got 4 new malnourished ducks from a friend of my neices. I think they are the same age as my ducks, or a little younger. Two mallards, a black crested, and one who I have no idea. How can I introduce them to my old flock without a problem?
I'm a chicken person just learning about ducks. I don't know if you integrate them the same as chickens or differently. Your best bet would be to post your question on the duck forum: https://www.backyardchickens.com/f/42/ducks Good luck and have fun with your ducks!
If they are malnourished, I imagine other needs were unmet as well. I would quarantine rather than put in right away with your other birds. They could be harboring, worms, mites, lice, disease. Welcome to the BYC flock.