Co-extinction : When a species becomes the plant and animal species dependent on it in an obligatory way also begin to extinct. For example, when a host fish species become extinct the survival of its specific parasites also get threatened. Another example that we know is the pollination of a specific plant by a specific insect and if this plant species anyhow become extinct, the insect dependent for completion of its life cycle will undoubtably become extinct i.e. Yucca plant is pollinated by Pronuba yuccasella. Therefore, extinction of will definitely cause the extinction of this moth.