Birds have evolved many different mechanisms and modifications that make them more well-adapted to the environment in which they live.
Structural differences (in beaks) are significant enough to make you into a new species, but you did descend from a common ancestor.
The adaptations that contribute to the most success allow that individual to survive and reproduce.
The adaptations that are contribute to a lack of success are not passed on since they either starve or have no “breeding rights”.

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