This happens in nature all the time, and interestingly it's to prevent competition. The classical model of this is Darwin's finches. A species of finch landed i

This happens in nature all the time, and interestingly it's to prevent competition. The classical model of this is Darwin's finches. A species of finch landed in the Galapagos millions of years ago, but over time began to speciate into different ecological niches. Rather than evolving into a generalist bird that ate every type of food, the birds evolved to specialize on specific trees and nuts. Each species became best for its given niche.