Through time, with the constant changes of "clan boundaries", migration or regime changes, clans would be made up of large numbers of members who were unrelated and who bore different surnames.

The Cadigal clan western boundary is approximately the Balmain peninsula.

Hence, they are no fixed clan boundaries.

The theft hadn't been very large, but it still might not be a bad idea to cross a few clan boundaries just to be on the safe side.

However, a weakness of such a system is that it proves ineffective at handling disputes and enforcing resolutions that cross clan boundaries.

By custom, marriage must cross clan boundaries (a form of incest taboo).

Hyenas will however ignore clan boundaries in times of food shortage.