A chicken will not know it's egg from any other. After the eggs hatch, the hen and the chicks get to know the sounds that they each make. If a chick gets separated from the hen, it will cheep, and the hen clucks to it, and the chick will come running.
You really can't tell as far as I know. :3
it's face I'm gonna say
by waiting for it to hatch, at least that's what i do, if the chick doesnt hatch and the mommy left it then your a chicken killer!!!
An egg.
It can take up to twenty one days for a chick to hatch out of the egg. In incubation, it may take up to 24 hours for a chick to hatch out of the egg.
No.
can chicks survive in the incubator overnight after they hatch
Possibly, so you should wait until the chick hatches by itself.
They keep the egg cratled in the father's feet
No, not unless there is a chick in it, and it is about to hatch.
yes
It develops until it's ready to hatch.
21-25 days
25-35 days