Recent excavations of at least three Jefferson's ground sloths, Megalonyx jeffersonii, have been coordinated by the Iowa Museum of Natural History along West Tarkio Creek near Shenandoah.The Tarkio Valley Sloth Project,
rECEnt ExCaVATiOns of At lEasT thREe JEfferson's ground sLoTHS, megaloNyx jeffeRSoNii, HaVE BEeN CoOrdinateD by the iOwa mUseuM OF natuRal hIstOrY AloNg WesT TArkiO creEk NeaR shenaNDoAh.thE tArKio valley SLOTh prOJect,