The following section focuses on the finches of the Galápagos Islands.
Read the information below and use it to answer the question below.
Galápagos Islands
The Galápagos Islands are home to a group of bird species known as Darwin's finches. The diagram below shows eight of these finch species, organized according to the type of beak they have and their main source of food as adults.
- Geospiza fortis: Medium ground finch with a strong beak. Its main source of food is seeds.
- Geospiza magnirostris: Large ground finch with a large, powerful beak. Its main source of food is seeds and insects.
- Geospiza fuliginosa: Small ground finch with a small, pointed beak. Its main source of food is seeds and insects.
- Geospiza scandens: Sharp-beaked ground finch with a sharp, pointed beak. Its main source of food is seeds and insects.
- Camarhynchus pauper: Small tree finch with a slender, pointed beak. Its main source of food is insects and nectar.
- Camarhynchus parvulus: Medium tree finch with a sturdy, cone-shaped beak. Its main source of food is insects and nectar.
- Certhidea olivacea: Warbler finch with a slender, pointed beak. Its main source of food is insects and nectar.
- Platyspiza crassirostris: Vegetarian finch with a short, wide beak. Its main source of food is plant material and seeds.
Question: How do the different beak shapes of Darwin's finches help them specialize in their main sources of food on the Galápagos Islands?