Medium ground finches with smaller beaks survived during the drought by feeding on remaining small seeds, while larger-beaked birds faced tougher competition for food.
One possible reason the medium ground finches with smaller beaks were able to survive during the 2004-2005 drought is that they were better suited to feed on the remaining small seeds. With fewer seeds available due to the drought, birds with smaller beaks could crack open and consume the limited smaller seeds, ensuring their survival. Meanwhile, birds with larger beaks, although able to crack open seeds of all sizes, faced higher competition for the scarce food resources.
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