Technically, they don't get clean. They usually bath in loess, which is a rich, dust-like soil.
yes
It depends, timid chickens will stay closer to their coop. Adventureous chickens may wander until their coop is no longer in sight
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.
No Chickens do not ducks
woman did stay and clean but not all the time cause they had to look after kids and clean
NO! They will kill them!
Animals can stay clean by having a bath not to often but not to less. Also being warmed often will help them to stay clean as worms make them dirty.
Chickens can be raised just about anywhere. If you provide safe shelter, good nutrition and plenty of clean fresh water a chicken will be happy.
Chickens are generally clean animals and clean themselves in dry soil to scrape insects off their feathers. When chickens peck themselves, they are removing any dirt or insects to keep themselves clean. However, you can bath a chicken maybe once every 4/5 months just to make the chickens feel cared for. It won't clean them effectively as the moisture can make the dirt wet and stick to the chicken's skin.
No, if the water is clean. They will most likely just get annoyed.
Chickens get their feathers fluffed up in about around fall and winter. Also some chickens don't need to fluff out their feathers unless it is a frigid -4 such as Buff Orpingtons.
. . . bathe