Occasionally we end up with a duck in one of our chicken coops. Sometimes those ducks would rather hang out with chickens than other ducks. Ducks are not susceptible to Marek's, so could work as a cross species companion. (Make sure the duck is female.)
No heat needed at that temperature. (I guess keeping birds cool is more of a concern for you).
Adding hiding places or places only the little ones fit can help.
The chicks can be very smart about how not to get pecked. I have seen my chicks push right between safe hens, but completely stay out...
The three week old chicks need heat while the older ones do not. As long as chicks can move in and out of the heat that may not matter. Some 10 week old chicks could be aggressive toward smaller birds while others of that age may not react much at all to them.
Both your setup and the...
Do not take the good egg away from the hen. Are you hoping for the hen to raise all the chicks? I know it was asked already, but the date the hen started setting and the date the incubator was started are key to what your options are.
Not everyone handles duck ratios the same.
Ducks form bonds and form territories. These bonds change throughout the mating season. Your number of drakes and hens may or it may not work fine. Adding more hens could make it better or it may not. Personally I try to keep my duck hens to drakes...
I put feeder ports in a large garbage can. I can put 150 pounds of food in it. I use multiple 5 gallon buckets with nipple waters. With the waters I would not want to rely on just one. This set up is designed for an occasional vacation. I still have someone look in on the birds each day.
Although hens occasionally crow, by far the majority of birds that crow are male. If a young bird is crowing it is safe to assume it is male. Looking at the pictures of your birds there is a possibility you have two male birds. How old are they? Up close individual pictures especially of...
I did the mirror with a duckling. It did fine and spent time looking in the mirror.
Chickens are flock birds, so getting more birds would be ideal, but chicken can live on their own. A few members have had chickens that choose not to hang with the flock. Others have had situations where one...