The branches and canopy of fig trees in tropical rainforests provide habitat for several thousand animal species, including insects, reptiles, birds, and rodents. Their fruit serves as a food source for many species during times of the year when other fruit is scarce. These fruit-eating species in turn provide prey for many different predator species. The benefits provided by fig trees suggest that, in the rainforest, they serve as keystone species. flagship species. disturbance specialists. ecosystem engineers. foundation species.