Smaller finches with less-powerful beaks perished. So the birds that were the winners in the game of natural selection lived to reproduce. The big-beaked finches just happened to be the ones ...
How do you know that finches' beak depth is heritable? You can see from Figure 2 that there is a correlation between the parents' and offsprings' beak size. How did the finch population change ...
The medium ground finch <i>Geospiza fortis</i> (illustrated here) diverged in beak size from the large ground finch (<i>Geospiza magnirostris</i>) on Daphne Major Island, Galápagos ...
Over time, natural selection favored finches with sharper, longer beaks. These birds were better equipped to quickly and easily pierce the skin of their booby bird neighbors. Vampire finches still ...
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