Male house finches of Santa Cruz Island, California, have, on the average, slightly larger bills and longer legs than do birds of the same species from the adjacent mainland. There is also somewhat less variability in the island population. These trends are discussed in reference to prevailing theory on evolution in island and colonizing populations, including Grant's hypothesis, the niche-variation model, the founder principle, and rates of gene flow.
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Dennis M. Power (1971) studied this question.
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