Venus has specially designed leaves that serve as natural traps. These leaves are covered with colorful, sticky stuff that attracts future meals. When a critter gets on the leaf, it gets stuck and the leaf closes to trap the prey.

Special juices digest the trapped critter. Venus has a good meal, and the leaf opens to do more trapping. This is a curious feeding habit for something that looks so beautiful innocent and harmless.

A rock can be put into one of the trapping leaves. When it finds out the rock cannot be digested, the leaf opens again to wait for a real meal. How does this curious plant have the sense to know the difference? She has no brain to control her sophisticated trapping system.