> Property … Originally it's just a legal term

No, see what happens when apes, hyena's, and animals from dozens of other species try steal each others food.

"mine" and "yours" existed long before language.

Sorry I should have been more specific. I meant privately owned land, not just personal property. You could argue that territorial “possession” of land is a thing animals have, but the concept of property goes considerably further than that IMO.