Land seems like one of the oldest and most "natural" forms of ownership -- Many animals, plants, bacteria, fungi will establish territory and defend it against conspecfics and competitors
They aren't defending land though, they are really defending access to resources contained in that land. If you drop a plant on empty land with no relevant resources for it, the plant will die. It will not become a landowner. Land ownership is a very recent concept in our history. Most of human history on this planet happened with no concept of owning land.
