The hummingbird drinks the nectar and eats small insects found inside the long tubular flower. ... The question remains: Why do hummingbirds prefer red flowers9 Presumably the nectar of the red flowers is more acceptable or more ... These traits evolve simultaneously in both species over many generations. ... Lichens are actually composites of algae (which provide energy by photosynthesizing carbohydrates), and fungi (which retain water necessary for the algaea#39;s survival).