On Ark Mobile, they will even build dams on land far away from water and without a fence/pen. I used an argy to carry wild ones from a distant area to an area near my base. I now have over 20 wild ones wandering around making dams all over.
Seems to harvest more wood per hit than a mammoth, but the mammoth has better weight reduction, so just get your hairy-elephant to follow your splinter-mouse. Now admire the open plain where a proud forest once stood and laugh uncomfortably.