A few ants and bees are capable of producing diploid female offspring parthenogenetically. Female nymphs are born which grow rapidly and soon produce more female offspring themselves. A daughter is a female offspring. Larger females, in contrast, had more female offspring. They also cause gamete duplication in unfertilized eggs causing them to develop into female offspring. Edwards syndrome occurs in all human populations, but is more prevalent in female offspring. Unfertilised mite eggs produce male offspring, that are able to mate with the female offspring. The female offspring of Helios were called Heliades. Female offspring often remain in their natal groups. Brood sizes were similar, but female offspring died before reproducing. Therefore, batches of female offspring have fathers of a completely different genetic origin. Female offspring remain in the colony while male young disperse. Female offspring are also allowed some milk after sexual maturity. Carrion crow ("Corvus corone") were found to produce more female offspring in favorable environmental conditions. The female offspring proved fertile, but rarely so for the males.