We commonly see the dark umber, velvet lacy-winged Erebus Moths flitting about at dead of night, seeking food and mates so that their genes are carried on to the next generation. Oleander Moths are also attracted to bright lights in the evenings and surprise us with their polka-dot bodies and amusing zigzag flight. Fortunately, the oleander shrubs and frangipani trees recover from the caterpillers' feeding frenzy. Over immense swathes of time the dance of survival has been conjoined by plant and insect species to the mutual benefit of both. What we see survive in nature has run the gauntlet of selection by forces which allow only the most well adapted design plans to be passed on in the genes to the next generation.
Poor designs fail the test with probable death and possible extinction of a whole species.