...I would quote only one thing: ARTIFICIAL SYSTEMS like species and subspecies were created to help for understanding natural groups of animals and their relationships. Not vica versa!
So it is a kind of weird when we are talking about "interbreedings in the wild". Boas can not interbreed in the wild, because interbreeding is something that is related with human intervention.
Of course, there exist several transitional forms in the wild that we can't recognise as separate subspecies. But this is simply because our human created systems have just too many limits. That does not mean that these populations should be considered or called as
"interbreds" IMO. I hope you see my point.

Regards,
Adam

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