 The behavior of plants is inflexible. It is genetically determined and, therefore, not modifiable by learning. Natural selection has favored the behavior, since historically it has been beneficial to the plant species. But it need not be now. If, for example, flies start to carry on their wings some substance that sickens Venus Fly Traps for several days afterwards, this will not have any effect on the plant behavior with respect to flies. Each Venus Fly Trap will continue to snap at flies as long as it has the strength to do so.