I just had a close call with two Northern Pacific rattlesnakes.
I know you don't have these venomous snakes in the UK. So it's important to remember that although venomous, the snakes are not aggressive. Their first response is to coil defensively and remain motionless. Their second is to slink off into the underbrush. If neither of these work, they issue their famous auditory warning. If a hiker accidentally touches them, they may strike without warning. And of course there are individual differences between snakes. But I have come to admire their cool demeanor.
But this situation was very different. A friend and I hiked to a rock ledge overlooking a stream. I dumped my pack to take some photos downstream. We were gone about an hour.
For some reason (laziness) I chose a different route back to my pack. I'm glad I did! Two enormous rattlesnakes staged a combat dance in the shadow of my pack. If I had approached from the other side, I might not have seen them until I was much closer.
I have never seen a combat dance before and had no idea they did that. It's a fascinating behavior. The two hormonal males put on quite a show!
Here's more details on how the whole thing went down, along with pictures and some research I did to interpret what I saw.
Rattlesnake Dance
I feel lucky to have seen it -- in several ways! Have you guys seen anything like the combat dance with UK species? 
- Woodsorrel aka "Dances with Snakes"
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