There's an interesting comment about a similar thing happening with rattle snakes. It seems they evolve into silent snakes to better avoid human predators: http

There's an interesting comment about a similar thing happening with rattle snakes. It seems they evolve into silent snakes to better avoid human predators: http://www.abc15.com/news/region-phoenix-metro/central-phoenix/rattlesnakes-evolving-losing-their-rattles-expert-says http://www.abc15.com/news/region-phoenix-metro/central-phoen...