A blue feather caught my eye, so I stooped to pick it up and continued down the trail, twirling it between my fingers. I was temporarily entranced by its simple beauty, which is how I came within striking distance of one extremely unsociable rattlesnake. The hissing of a hyperactive rattle burst into my consciousness, and I jumped back when I saw the diamond-shaped head cocked and ready to strike. As usual, that was too close. The intolerant creature glared balefully at me from the side of the trail, then turned and slinked down into the brush, giving its tail one last violent shake before it disappeared. Well, I didnít know there were rattlesnakes in Yosemite National Park, but I do now.