amout of food available
adaption of the finches to different environment
how finches use their beaks
natural selection
beak structure
beak structure
The beak
beak structure
beak structure
beak structure
adaptive radiation
Darwin observed that the finches on the Galapagos Islands had unique beak shapes and sizes that were adaptations to different diets. These variations in beak structure led him to hypothesize that the finches had evolved into different species to better exploit available food sources on the different islands.
He realized the the finches had been able to adapt to their natural surroundings to survive.