A hunter-gatherer or early human society is one in which most or all food is obtained from wild plants and animals, in contrast to agricultural societies, which rely mainly on domesticated species. Hunter gatherers primarily moved from place to place in search of food or water. When they had eaten the available food in one place they would need to move on further to find more to eat. They would also follow herds of animals that they might be able to hunt. Water would have been very important for them to drink, so if their local water supply dried up they would have needed to travel to find another source. Sometimes they also moved from place to place because of the different seasonal weather conditions.