Here are some more pictures of the snake slithering up to the rocks. What kind of snake is this?

http://yosemitephotos.net/main.php/v/jobe/051.JPG.html

http://yosemitephotos.net/main.php/v/jobe/052.JPG.html

http://yosemitephotos.net/main.php/v/jobe/053.JPG.html

http://yosemitephotos.net/main.php/v/jobe/054.JPG.html

http://yosemitephotos.net/main.php/v/jobe/057.JPG.html

http://yosemitephotos.net/main.php/v/jobe/060.JPG.html

http://yosemitephotos.net/main.php/v/jobe/063.JPG.html

http://yosemitephotos.net/main.php/v/jobe/069.JPG.html