The great thing about the ancient alien theory is the fact that we can compare modern achievements with stories from our ancient past ,and so if today were able to create a two headed dog with six legs ,is it possible that a similar creature existed thousands of years ago?
and i say yes
ancient astronaut theorist
The only way to disprove the ancient assounaught theory is for the exxaterestrial's to come down ,and tell us that they were never here.
Does believing you're the last sane man on the planet make you crazy?
~Samuel L. Jackson-I Robot
no, if they somehow get thru the prezygotic barriers and are able to mate, than there will be postzygotic barriers preventing from either mating or making offspring viable. by definition you can only make viable offspring within same species anyweay
"We are what we repeatedly do. Excellence, therefore, is not an act but a habit"---Aristotle