In the south-west, in Nyoongar culture, a social order is fastidiously maintained as people are born under moieties, one being Wardong (the crow) and the other being Monarch (the white cockatoo).
A person from the Wardong clan can never marry another person from Wardong clan and someone from Monarch can never marry a person from their own clan.
The children from these marriages will go back to the grandmother in a matrilineal system or back to the grandfather in a patrilineal system.
Placentas from children are buried under certain species of trees for females and certain species of trees from males.
Anything that interacts with these trees will also become the child’s totem.
It forms part of their kinship system and it determines the laws that govern their life, including who they can marry.