In his memoir, The Voyage of the Beagle, Darwin noted ... On various islands, finch species have become adapted for different diets: seeds, insects, flowers, the blood of seabirds, and leaves.

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 ...

They drink the blood of larger birds, such as the Nazca and red-footed boobies, to supplement their diet when food is scarce ...

David Lack's classic work on the finches of the Galapagos Islands (Darwin's Finches) was first published in 1947; few books have had such a great impact on evolutionary biology, indeed it is still one ...

These findings suggest that, because of the links between beaks and song, an entirely new species of Darwin's medium ground finches could evolve in response to six major Galapagos droughts.