Final answer:
Birds with longer beaks may be able to reach deep into flowers to extract nectar, while birds with shorter beaks may be better equipped to pick insects off of leaves or tree bark.
Step-by-step explanation:
Another trait that you would expect to vary with beak length in a bug population is the ability to access different types of food sources. Birds with longer beaks may be able to reach deep into flowers to extract nectar, while birds with shorter beaks may be better equipped to pick insects off of leaves or tree bark. The variation in beak length can lead to a division of labor among the bird population, with each beak length specializing in a specific type of food source.