A white ass, but NOT an albino, has been described without either spinal or shoulder stripe; and these stripes are sometimes very obscure, or actually quite lost, in dark-coloured asses.
Asto zuria, baina ez albinoa, ez lepo ez eskapula gaineko marrarik gabe deskribatu izan da, eta asto ilunkaretan ere marra hauek oso ilun, edo zeharo galdurik, aurkitzen dira batzuetan.