eli5: How can flies react to us so quickly but not a Venus fly trap that’s closing its leaves?

Question

eli5: How can flies react to us so quickly but not a Venus fly trap that’s closing its leaves?

In: 5

Answer 1

Venus Flytraps only have to move a few centimeters to trap a fly, while humans have to move several feet to swat one. They can see us coming from a mile away.