 Nyorai kupfuurira kweiyi ndima - Xenarthrans mhenyu dzine mwero wakaderera zvikurusa wetsandanyama pakati pa therians. Paleoburrows akawanikwa ayo anosvika 1.5m upamhi uye 40m refu, pamwe claw zviratidzo kubva kuchera kunotaurwa pasi sloths Glossotherium kana Scelidotherium. Zvimwe zvisaririra zvetsuro dzepasi Mylodon nedzimwewo mumapako zvakajairika zvikuru munzvimbo dzinotonhora, zvichiratidza kuti tsuro dzepasi dzingadaro dzaishandisa makomba nemapako kuti dzibatsire kudzora tembiricha yemuviri wadzo. Kuongororwa kwezvicherwa zvezvipuka zvemuSouth America zvemuLujan kunoratidza kuti paiva nemhuka dzakawanda dzaidya zvinomera kupfuura zvaigona kutsigirwa nedzimwe nzvimbo dzemazuva ano. Sezvo mhuka zhinji dzakakura dzeLuhan dzaiva xenarthrans, mwero wakaderera wemetabolism ungava unhu hwechikwata chose, uchibvumira masango ane zviwanikwa zvishoma kutsigira nhamba huru yemhuka huru. Ongororo yezvipuka inoratidzawo kuti zvipuka zvikuru zvinodya dzimwe mhuka zvaiva zvishomanana munguva yaivapo GABI isati yaitika.Fauna dzokuSouth America dzakakwirira kupfuura zvingakarirwa zvichienderana nefauna dzazvino mumamiriro ezvinhu akafanana. Izvi zvinoratidza kuti pane zvimwe zvinhu zvaiita kuti nhamba yevanonzi xenarthrans iwedzere. South America yakanga isina placental inodya mhuka kusvika kuPleistocene, uye xenarthran yakakura-mhuka inodya mhuka inogona kunge yakave yakatarisana nezvikonzero zvakawanda kusanganisira kuwedzera kwenhamba yemhuka dzinodya mhuka, kushandiswa kwezvinhu kuburikidza nekuparadzira North America herbivores nekukurumidza metabolism uye yakakwirira yezvokudya zvinodiwa, uye kuchinja kwemamiriro okunze. 