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On this island, there is a population of a species of crow, but within that population, there is genetic variation. Some crows have short beaks, making it easy to collect seeds on the ground and crows with large beaks, making it difficult to collect seeds.
Eventually, the crow will end up producing offspring with both long and short beaks.
Eventually, the crows began to produce at such a rapid rate that more offspring were produced than could survive. This is known as overproduction.
Over time, the crows with shorter beaks were able to collect more seeds. This gave the birds with short beaks a reproductive advantage. The number of crows with short beaks began to outnumber the crows with long beaks.
In the future, the crows began to only reproduce with the crows having the same length beak.
After this event, the crows grew so far apart between the long and short beaks, that they, eventually, became two different species through the process of speciation. Over a period of time, the disruptive selection would cause the short beaked crows to outlive the long beaked ones for their ability to gather resources better.
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