A species of bird in the forest have specialized beaks for pecking through nuts and eating them. The birds with the larger beaks are able to crack open the bigger nuts and the birds with the smaller beaks are able to crack open the small nuts, but the birds with the medium beaks can't pick through the small nuts or crack the big nuts and are eventually eliminated due to natural selection. The two extremes in beak sizes are selected for causing the big birds to grow bigger with bigger beaks and the small birds to become smaller with smaller beaks. Their genome becomes different that they can no longer interbreed. What type of speciation is this an example of?
a. peripatric speciation
b. parapatric speciation
c. allopatric speciation
d. sympatric speciation
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