Never mind the size of the Ark - how did he keep the animals from killing each other & the humans? And where did the waste go? That must have been a full-time job right there.
According to Genesis 1, man and all the animals were vegetarians:
Genesis 1:29 And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth, and every tree, in the which is the fruit of a tree yielding seed; to you it shall be for meat.
30 And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat: and it was so.
This changed after the flood. In Genesis 9:
Genesis 9:2 And the fear of you and the dread of you shall be upon every beast of the earth, and upon every fowl of the air, upon all that moveth upon the earth, and upon all the fishes of the sea; into your hand are they delivered.
3 Every moving thing that liveth shall be meat for you; even as the green herb have I given you all things.
No doubt. Maybe they threw it over the side. As far as keeping the animals from going nuts, the Holy Spirit had to be covering everyone and everything in the boat, providing peace. Makes sense that would have been the case.
Believing n the bible requires suspension of disbelief....a lot of it.