(1) In predation one species is benefitted ' + ' while the other is detrimental ' - '. Pisaster is an important predator in the rocky intertidal communities of the American pacific coast. (2) In many species of fig trees, there is tight one-to-one relationship with the pollinator species of wasp. It means that a given fig species can be pollinated only by its 'partner' wasp species and no other species is an example of mutualism. (3) Plasmodium is an endoparasite in humans that causes malaria. (4) The Mediterranean orchid Ophrys employs 'sexual deceit' to get pollination done by a species of bee.