ANATOMY

Detailed explanation-1: -On the Galápagos, finches evolved based on different food sources-long, pointed beaks served well for snatching insects while broad, blunt beaks work best for cracking seeds and nuts.

Detailed explanation-2: -What is the advantage of having different shaped beaks? To look different from other species. To be able to eat the food readily available in the environment. Protection against predators.

Detailed explanation-3: -The different beaks tell us how the different finch species evolved over time according to their environments and diets. The different shapes of the beaks correspond to what the finches eat. For example, the cactus finch has a longer, sharper beak to probe into cactus plants.

Detailed explanation-4: -The birds have inherited variation in the bill shape with some individuals having wide, deep bills and others having thinner bills. Large-billed birds feed more efficiently on large, hard seeds, whereas smaller billed birds feed more efficiently on small, soft seeds.