I suggest no falsifiable criteria at this time and I likely never will. I merely point out intellectually interesting plausibility. If you restrict all of you

I suggest no falsifiable criteria at this time and I likely never will. I merely point out intellectually interesting plausibility. If you restrict all of your consideration to only those things you already know how to prove or disprove, I think you severely limit ultimate discovery. Sure, you want to strive for determining truth, but I think it starts with curiosity, brainstorming, and inspiration. By the way, even snakes have figured out how to fly, or at least glide pretty well (see https://en.wikipedia.org/wiki/Flying_snakes https://en.wikipedia.org/wiki/Flying_snakes).