Inbreeding is NEVER a good idea unless they are birds that are endangered, or are of top quality.
Inbreeding doesn't incur noticeable fertility/hatch rate problems until 5 generations of inbreeding. However, it will cause some serious birth defects.
They would if they could, but roadrunners live in arid, dry areas, where there is no oppurtunity to have fish.
If your answer is... Is it possible for the hatched pokemon to have the same moves as the father or the mother then yes it could
There could be various reasons why a chickens beak is black. It could be bruising from other chickens or an infection.
Impossible to predict. The record for the time between mating and production of a fertile egg in a bird, is 6 weeks, in a canary. There is no reason to believe that chickens could not do the same under perfect conditions.
It could be out of fear of predators
A rooster can't lay an egg, and if it could chickens can't fly so they wouldn't be able to get on top of a house.
There are 7 hatcheries around the country where you could by chickens from. They are located in New Mexico, Ohio, Pennsylvania, Texas, Iowa, and Missouri.
If your chickens are housed with other chickens my guess is that the other chickens plucked the feathers. That's what happens to our chickens.
that it could kill all the chickens
You could if you want to.
It could be an Albino, these are rare and you would be lucky to have one.
You could take to a lab or a vet they have these special machines that can tell if its fertile or not