This page explores the definition of species as interbreeding populations and the processes of speciation, including geographical isolation and adaptive radiation, exemplified by Darwin's finches. It ...This page explores the definition of species as interbreeding populations and the processes of speciation, including geographical isolation and adaptive radiation, exemplified by Darwin's finches. It discusses hybridization and various speciation types, such as allopatric and sympatric, with examples from plants and animals.