anecdote: i used to raise chickens and guinea fowl. guinea chicks were worth a lot more than regular chicks, but guinea mothers are terrible and the chicks were incredibly stupid. chickens are surprisingly intelligent at times.

it takes 21 days for chickens to hatch and 28 days for guineas to hatch. I'd set up batches to hatch at the same time in my incubator and let the chickens keep 2 eggs each. after the allotted time, i'd have my 15 chicken hens hatch 20 out of their 30 eggs. i would also have around 60 guineas hatch from my two incubators all in a 2-3 day time span

after a day of letting them dry off, i'd stick the guineas in with the chickens and their babies, so they could raise the guineas properly (teach them to drink, peck, and roost instead of leave them behind and fly into a tree, or lead them into deep water and watch them drown)

i had two dogs and they kept the predatory birds and animals away, and the hens raised the guineas really well. it was rare to lose a chick.

when the guinea moms raised their own, i'd lose at least 75% of the chicks.

tl:dr chickens will raise and mother anything and do it well.