How does hybridization contribute to speciation?
Allopatric speciation occurs when there is a physical barrier such as a mountain or a river that seperates both species overtime long enough that they begin to develop specific characteristics and reproduce on their own.
Sympatric speciation occurs when there is a genetic barrier (mutation) that causes a different mating season or preference in mate choice.
In certain cases, hybridization does not lead to healthy offspring (the offspring is sterile). Hence, they are not considered a new species. As I mentioned earlier, it's only speciation when the offspring is able to reproduce as well.