The two animals are called commensals. Commensalism is a type of symbiosis . These organisms interact and influence each others survival. An optic nerve then carries this information to the insect's brain. A consumer is a living thing that eats other living things to survive.
Primary consumers eat producers, secondary consumers eat primary consumers, and so on.
There are always many more primary consumers than secondary consumers, etc. An example of convergence is the wings of Pterodactyls and bats. The costal fold is a fold on a male butterfly forewing's leading edge. This fold contains the male's scent scales . The cuticle is the outer, non-cellular layer of an insects chitinous exoskeleton .