In order to survive, living things must survive and reproduce, which requires the materials that make up the body and the energy to maintain an orderly state, so living things need to eat. However, there are many creatures here, but the food is limited. Because of a gene mutation, organisms from different food sources can be developed, and they will gain an evolutionary advantage. So creatures have evolved many ways to use food like stars.

1977, there was a drought on Daphne Major in Galapagos Islands, and Geospiza fortis couldn't find anything to eat, so he had to eat the seeds of Tribulus terrestris.

Look at these thorns.

Those Midlands finches with big mouths survived because they could crush the seeds of thistles. This is a clue to a new recipe. What will the Midlands finch look like if the drought continues? There is a real example. Geospiza magnirostris, who also lives in the Galapagos Islands, has a bigger mouth than Midland finch and is suitable for crushing large and hard seeds.