I've been fishing in north central PA since 1965. I've encountered timber rattlers on the roads but until this past trip never on the stream. I had been fishing 30-45 minutes and caught my 7th trout. WAs feeling relaxed, took a photo and released the fish then decided just to sit back on the bank as I was kneeling right in front of it. Normally I would look around, however, I had been moving around and never thought to look back. I was retying and dressing my fly and suddenly heard the unmistakable rattle. It was behind and I didn't turn to look, I just rolled forward into the stream. When my heart started again, I saw them. Maybe 3 feet from by back. We presume that the smaller black one was a male ane the huge one the female. The smaller one never turned to look at me, just concentrated its attention on the big one. The girth of the yellow one actually turned my stomach. I'm sure for those of you used to diamondback encounters I seem like a woos. I've had three encounters with Mississauga rattlers in Ontario back in the 70's, so this wasn't my first. My thought is had it struck most likely would have hit the backpack of my vest, however, had it hit me in the neck it may not have been a good outcome.View attachment IMG_5164.jpgView attachment IMG_5173.jpgView attachment IMG_5153.jpgView attachment IMG_5156.jpg