Distinctive sparrow found only in Sierra de La Laguna mountains near the southern tip of the Baja Peninsula. Pale gray with rufous back usually extending onto wings, white outer tail feathers and a staring yellow eye. Rufous continues onto sides; bill half black, half yellow. Forages on the ground, but perches higher when singing. Song has a similar ringing tone to other juncos, but usually with several distinct sections of chips and trills.