The biological species concept is probably one of the most popular and very similar to what you are suggesting. In this concept, a species is an interbreeding population that is reproductively isolated from other populations (either due to genetics or geography).
The biological species concept is probably one of the most popular and very similar to what you are suggesting. In this concept, a species is an interbreeding population that is reproductively isolated from other populations (either due to genetics or geography).