BPNT Book Series - Chapter 29 - What about the size of the ark?

Nope, it's not impossible. Here's why. The ark was big enough to hold 530 railroad cars. They put 250 sheep in a railroad car these days, so that's 132500 sheep size animals. Yea, I know there's a lot more types of animals than that, but God only needed to preserve one of each kind of animal. He didn't need every species of dog, or cow, or giraffe, or cat. He only needed two of each kind and let the gene's that He designed do the rest of the work when they left the ark. Gen 8:19 Every beast, every creeping thing, and every fowl, and whatsoever creepeth upon the earth, after their kinds , went forth out of the ark. I mean, God is God. Why would we limit what He can do when He's the one who spoke them into existence in the first place? It only sounds impossible if we think about trying to do it without God. Then I think it would be impossible.

https://prophecyandtruth.com/creation/ark.html