Normally the snakes aren't out when I hike because it's too hot. But Phoenix had a couple days of rare rainy, gray weather and, well, I guess the rattlesnakes got tired of hiding out beneath their rocks all day.
And this rattlesnake was green. The ones I had seen before were brown. So, being the weirdly curious person I am, I came home and immediately researched it. (No, it did not bite me, thank god.)
Seems the rattlesnake was a Mohave rattlesnake or crotalus scutulatus. They can grow to about three feet but the one I saw was two feet. The venom can be debilitating and deadly if left untreated. Fortunately the rattlesnake and I didn't reach that point in our relationship. I made a bee-line and went completely off the path, giving the rattler plenty of room.
Always an adventure.