Hummingbirds have a beak just the right length to reach the nectar in a cardinal flower and as they feed, they touch the pollen structure, transferring pollen from one flower to another.
Coevolution, Convergent Evolution, or Divergent Evolution?
I believe the correct answer would be Coevolution.
The definition of coevolution is "Two or more species evolving together" and as the hummingbird and flower influence one another I believe that would be the perfect example of coevolution.
