Mostly for Aussenseiter! The ship of theseus isn't a ship at all!

[Landroval]

Their relation is symbiotic. The trees eat their shit made up of their fellow brethren trees.

As a note aside, I'm waiting for koalas to manifest on the eucalyptus trees in my back yard.

Oh and koalas aren't Ursine. Marsupials are actually more closely related to rodentia.