A population of hummingbirds feeds exclusively on nectar from orchids. Two species of orchids exist in the hummingbirds' habitat. One orchid species has long tubes to store nectar while the other has short tubes to store nectar. The hummingbirds have a range of beak lengths, and the beak length determines which nectar tube an individual can feed from. This population of hummingbirds is splitting into two phenotypic groups. What scenario best explains why the population is diverging?

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