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. 1. Identify a type of variation in the worms.

2. Which variation is most favorable?

3. In 50 years, what will natural selection have most likely done for the worms? (Hint: What type of worm will be the most common.)

4. What adaptations might occur in the birds in 100 years?