That meme going around about how #rattlesnakes are evolving to lose their rattles because humans keep killing the ones that rattle? It's a just-so story. I get why those are often satisfying, but they're just as often nonsense. And for all its sins, Google is still your friend when it comes to this kind of thing.

https://rattlesnakesolutions.com/snakeblog/science-and-education/are-rattlesnakes-evolving-to-rattle-less-or-losing-their-rattles/