Speciation can occur more or less immediately if two species produce a successful hybrid. It's much more common in plants, but it happens in animals too. The id

Speciation can occur more or less immediately if two species produce a successful hybrid. It's much more common in plants, but it happens in animals too. The idea is, you have two species that occasionally produce viable offspring, which are themselves reproductively isolated from their own parent species. https://en.wikipedia.org/wiki/Hybrid_speciation https://en.wikipedia.org/wiki/Hybrid_speciation