A complex web of relationships exist in rainforests. Rainforest insects often form very close relationships with particular plants. Euglossid bees are the only pollinator of Cycnanthes and Stanhopea orchids. Each fig species has its own micro-wasp pollinator. Arrow poison frogs derive their toxins from the insects they eat. Brazil nuts rely entirely on agoutis to disperse their seeds. Driver ants are destructive, but over 65 species of bird feed on them in Ecuador.