Thanks for the info, Steve.
A couple of additional points:
If a Sierra Nevada hiker or climber sees a Big Horn Sheep, they should note their location and report it to California Fish and Wildlife. Many trailheads now have notices regarding reporting. This can be important to biologists, since the sheep are highly mobile and can and do leave their usual areas on occasion.
If you see Big Horns, DO NOT APPROACH them. They are not dangerous, but are very easily frightened by the presence of humans. This especially important if lambs are present.