Why does a chicken egg take less time to hatch than an Emu egg?

because the chicken egg is much smaller than the emu egg . and ask jeeves cuz i dont know haha because the chicken egg is much smaller than the emu egg . and ask jeeves cuz i dont know haha speaking from having experience raising chickens they take less time because the yolk takes less time to develop into a chick unlike a emu their eggs are ten time bigger so the egg needs more time to hatch