>>I would think that there would be some natural hybrids out there, but have never heard of such a thing. Has anyone else?


There is no doubt it happens on occasion but for the most part these species are utilizing different habitats where the ranges overlap. The best places to look for hybrids is in places habitat changes or alteration has put the species in the exact same habitat.

You also have to consider that it is an infrequent event compared to same species breeding, otherwise these speciation events would not have occurred in the first place.

Finally, any hybrids that survive may only be recognizable in the first generation crosses. When and if they breed that generation is 75%/25% and could be difficult to distinguish from natural variation.
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