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A normal environment with one species of bird.
It starts to downpour because of irregular weather patterns.
A river forms which separates the land.
The birds are separated by the river, one side of the river doesn't have as many trees now.
Isolation Mechanism (Geographic): The river has separated the birds. The birds not near the trees have to evolve to survive without the trees into another type of bird.
The river increases in size and the birds keep on evolving until they are two difference species and they reproduce separately.
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