strategies to avoid arachnids serve as evolutionary response to threat . Scientists suggest it may suggest arachnophobia represents survival instinct . snakes date back to early human evolution in Africa , where snakes with very strong venom existed millions of years ago .
Instinct to avoid arachnids developed as evolutionary response to threat . Scientists say it could mean arachnophobia represents survival instinct . Could date back to early human evolution in Africa , where spiders with very strong venom existed millions of years ago .