Nomads, so the scholars of Teleleli say, are those barbarians who have domesticated animals but no agriculture, and thus must wander from place to place, since their herds quickly eat all the grass in a given area.
Among those nomads who ride animals, rather than walking or using chariots or wagons, women will often suffer miscarriages and other maladies of the womb. For this reason, such nomads are often unable to replace their dead through natural increase. Thus they will often be most eager to have new members join their number.This may lead to customs of the highest virtue – such as welcoming any refugee or exile who comes among them – or the lowest vice – such as raiding strangers that they may steal their infants and raise them as their own.
My thanks to Magister Noisms for his research on this subject.