Evo Weblabs, Natural Selection

In natural selections, I have decided to do an experiments on birds. What I have been told was that birds, or all organisms for that matter, evolve based on adaptation. Meaning they evolve to adapt which basically means that they evolve into organisms that help them survive. Birds with big beaks can crack seeds, but birds with smaller beaks and eat worms inside of the trees. However, after running the experiment many time with different inputs, I can come to a conclusion that having a small beak will not guarantee survival, where as having large beak will guarantee survival on the planet. What eventually does happen is that the birds with larger beak will have a larger population where was the birds with the smaller beaks will evolve into birds with larger beaks.

Experiment 1:

Experiment 2: