How do these peculiarities helps finches in their survival?
The different beak shapes and sizes of the finches help them to survive by enabling them to feed on different types of food. For example, finches with larger, stronger beaks are able to crack open the hard shells of nuts and seeds, while finches with thinner, more delicate beaks can feed on insects. By having a variety of beak shapes and sizes, the finches are able to access a wide variety of foods and thus increase their chances of survival.