A team lead by Nicholas Block from Stonehill College discovered this by analyzing the DNA of muscle and feathers from over 117 of the songbirds This showed a variation in their mtDNA of up to 7.6% which is a very large amount for animals within the same species. To compare, human variation, from anywhere on the planet, only varies by about 1.5%. Despite having separate ancestors, the separate species are coming back towards being one species. Being that this is a rare event, it shows that, although very unusual in nature, very unusual events do occur in nature.
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