"Lonesome" Bighorn sheep at Arizona Sonora Desert Museum He has the less curvy horns of the Sierra Nevada bighorn sheep as compared to those of the Desert bighorn sheep. He's 'lonely' indeed, for "Sierra Nevada bighorn sheep were listed as an endangered species on January 3, 2000, following emergency listing on April 20, 1999.[5] In 1995, these genetically distinct Bighorn Sheep hit a population low of about 100 total individuals, distributed across 5 separate areas of the southern and central Sierra Nevada, and had increased to about 125 in 1999." As of 2002, their numbers only reached to 250. (Wiki source) ©Joan Ann Lansberry, 2012-2013 Photos for "Photo Friday" Themes Photo index Home