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Adaptive radiation is a rapid form of speciation that takes place when there is a mass Immigration to new ecological niches, or a mass extinction of one dominant life form opening up niches for other life forms. Darwin's finches are examples of the former, as they reached the Galapagos Islands as one species and radiated from there into many different species of birds make there living in various ways that called for morphological changes, basically in beak size and shape. The death of the dinosaurs is an example of the latter radiation event. That is when several types of small mammals radiated out into all the niches left open bu the dinosaurs.

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