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Unlike the rest of the thick beaks, these birds' beaks are straight, not curved. This is similar to the shapes of the thin beaks.

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These birds have the thinnest beaks of all the finches and may be best suited for delicate tasks like picking up small bugs from flowers.

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The variation in beak size and shape may be due to a change in food source.
These birds all come from the same common ancestor, but their environments have shaped them into their different species.

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The finches with a smaller, thicker beak could be best suited for picking up insect larvae.

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These finches have thicker, bigger beaks that may be suited for breaking through something thick like a cactus.

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All of these finches have the similar characteristic of a longer, thinner beak that could be beneficial to fit inside a small space like a hole to get food.