8. There are 2 types of worms: worms that eat at night (nocturnal) and worms that eat during the day (diurnal). The birds eat during the day and seem to be eating ONLY the diurnal worms. The nocturnal worms are in their burrows during this time.
Each spring when the worms reproduce, they have about 500 babies but only 100 of these 500 ever become old enough to reproduce.
What are the variations in the worm population?