California Department of Fish and Wildlife

Sierra Nevada Bighorn Sheep In Yosemite

Mt. Gibbs

S160 - Ewe (kmz)


S79 - Ram (kmz)
Click bighorn photos to view movement data
in Google Earth™

    Recent Events

  • 11/20/20131. After making multiple excursions to Mt. Gibbs and the Kuna Crest often traveling through dense forest, unusual for Sierra bighorn, S172 has returned to her perch on the NW ridge of Mt. Dana where she could be visible from the road.
  • 8/8/2013 A total of 6 lambs have been born to the ewes of the Mt. Gibbs herd! This is the largest number of lambs observed in this population. Two of the lambs were born to ewes translocated here in March. The remaining 4 lambs were born to the native ewes.
  • 6/1/2013 Observations during May show a total of 19 bighorn: 10 adult ewes, 2 yearling ewes, 5 lambs, 2 adult rams. Not all ewes have been observed, so more lambs are possible.
  • 5/10/2013 S172, one of the new ewes, resides on the west side of Mt Dana and may be visible from the park entrance.
  • 3/27/2013 After years of low lamb production, a sign of possible inbreeding depression, CDFW added 3 ewes with high genetic diversity to the population. This is the first attempt in the Sierra to perfom a genetic rescue. It would not have been possible without genetic research carried out by the Sierra Bighorn Foundation.
  • 2/15/2013 S78 dies (11 year-old ram)
  • 10/28/12 New GPS collar deployed on S79 (adult male), previous collar full of data retrieved.
  • 07/26/12 CDFW staff observed 12 bighorn (7 adult ewes, 1 yearling ewe, 2 yearling rams , 1 lamb, and 1-2 year old ram) including all collared ewes.

View seasonal maps as annotated video below
or as a photo set on Flickr.com.


Alpine Summer near Parker Pass
Alpine summer near Parker Pass

Landsat - Satellite Images
The Landsat program offers the longest continuous global record of the Earth's surface by capturing images from space. United States Geologic Survey (USGS) has been using this system since the 1970's. Landsat imagery is taken approximately every two weeks. The image resolution is based on a 30m x 30m pixel size. The data are used for a wide variety of scientific investigations. Our program uses this information to describe snow cover. Images show snow (turquoise), bare ground (brown), and vegetation (green). Images were selected to show differences in habitat use patterns at various times during the year.
Animated map of translocated Mt Gibbs ewe movements after release