The ancestors of vombatiforms were likely arboreal, and the koala's lineage was possibly the first to branch off around 40 million years ago during the Eocene.
Os antepasados dos vombatiformes foron con toda probabilidade arborícolas, e a liñaxe evolutiva dos coalas foi probablemente a primeira en ramificarse hai uns 40 millóns de anos, durante o Eoceno.