This is Hummy the hummingbird and all her siblings. As you can see, Hummy looks different than a few of her siblings, showing the variation in this particular population of hummingbirds. This variation is due to natural selection.
A long time ago Hummy's father lived in harmony with all his hummingbird friends who all had the same traits as him. All of a sudden, Hummy's mom got separated from her population and encountered her father's population.
Hummy's mother has a much longer and skinnier beak than Hummy's father. Because the length of beaks is heritable, when they bread together, heritability passed down long, skinny beaks to 50% of their offspring, and short, stubby beaks to the other 50%. Hummy was born with a long skinny beak.
Having a long beak serves as a reproductive advantage because it makes sucking the nectar from flowers a lot easier and faster than with a short stubby beak
Because these hummingbirds adapted long beaks through natural selection, they adapted better to their food source in their environment and thrived.
Hummy and her family thrive in the forest and live in harmony with their hummingbird population.