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The social structure of the Galapagos mockingbird (left) is unusual . They form cooperative breeding groups made up of the male and female plus the offspring of previous broods. They assist their parents in maintaining their territory and raising the next brood. |
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The first finches to arrive on the islands looked more or less the same, but they evolved over time into many new species, each species with a characteristic beak shape and muscle structure specialized to a particular diet. |
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Ground finches apply pressure at the base of their beaks which helps them crush hard-shelled nuts. |
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