More than half of all species on Earth are parasites

But from what we do know,we can tell that they have a pretty diverse toolbox.Gordian worms seem to affect crickets' brains directly.The malaria parasite, on the other hand,blocks an enzyme that helps the mosquitoes feed,forcing them to bite over and over and over again.The rabies virus may cause that snarling, slobbering behavior by putting the immune system into overdrive.But whatever the method,when you think about how effectively these parasites control the behavior of their hosts,you may wonder how much of human behavior is actually parasites doing the talking. Since more than half of the species on Earth are parasites, it could be more than we think.