Genesis 7: Issue (Could Noah really get all the animals onto the ark?)

Many people apparently believe that the ark wasn't big enough to fit all the animals on the earth, but others argue that they would all fit if Noah gathered only baby animals. Wouldn't it be hard to pull baby cubs away from their mothers? How would it all work?

I also heard that every culture has a flood story. Does every culture also have a Noah's ark story? Are there any good resources on this stuff? Thanks in advance for your responses!