Natural method for dying chicken eggs while still in the chicken

Chickens who feed on human babies?:eek::eek::smiley:

Might not be a problem - apparently parthenogenesis is not unheard of in poultry.

Before the embryo starts to develop (during incubation), eggs can be quite unaffected by low temperature - it’s not uncommon for birds to lay a clutch of eggs, one or two per day and leave them completely exposed (at springtime temperatures), then begin incubating them all at once - and they all hatch at the same time.