A group of eggs/chicks laid or hatched together is often referred to as a "hatch", "brood" or "clutch".
a number of young hatched at one time, a family of young, is known as a Brood
having hatched numerous chicks i can say that all chicks are not yellow. in my experience the yellow chicks become white or pale coloured hens, i have hatched grey chicks, brown chicks & black chicks
The chicks should all stay in the incubator until the hatch is complete and the chicks are fluffy and dry. They should all be moved to the brooder box at the same time. The chicks will roll the peeping eggs and that is ok. Sometimes the movement of the completed chicks will get the emerging chicks to begin and that is a good thing. Do not be hasty in removing the newly hatched chicks from the incubator, they can and should remain in there for up to 24 hrs.
the chicks will be many
The male emu is the one who incubates the eggs. For the entire time he is sitting on the eggs that (usually) several females have laid, he does not eat or drink, but just stands several times a day to turn the eggs. That is the only movement he makes until the chicks have hatched. He is also the one who raises the chicks.
Springtime is the usual time to start a hatch. It depends on where you are and the weather conditions. Plan for the clutch to start incubation when temperatures reach above zero continually so the newly hatched chicks do not suffer from extreme cold. Naturally brooded chicks will use the broody hen for a heat source for about 3 weeks after hatch.
When a group of baby chicks is hatched around the same time by the same hen, it is a called a clutch.
Just let her be. The newly hatched chicks will take up some of momma's time and the room under her but the mother hen will adjust things by herself. Trying to do this for her will just stress her out and may cause her to leave the nest. The new chicks will find room under her wings eventually and mother hen will roll the unhatched eggs closer together.
two chicks at the same time
They aren't related at all. They just were born/hatched at nearly the same time.
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The only limit to the number of chicks a single chicken can raise is the number of eggs that will fit under her and stay warm. This number depends on the size of the chicken and the construction of the nest. Rhode Island Red chickens can brood about 12 eggs at the time. The eggs are laid one per 24-28 hours and when the hen sees there are enough in the nest, she will begin to sit on them. When the chicks hatch they do not need food for several days. By that time they are strong enough to leave the nest and eat on their own.