Speculation

According to the Book of Genesis, Methuselah was the son of Enoch, the father of Lamech, and the grandfather of Noah
end partial quote from:
https://en.wikipedia.org/wiki/Methuselah

Although from my point of view it could be that Methuselah was from Mars or Maldek and either died there and then Noah came to earth bringing animals we are more used to here that were domesticated there on Maldek and Mars, it is more likely that Methuselah and father and grandfather lived on Atlantis and the Great Flood was Atlantis that Noah Built his ark so save these species.

However, since these species likely lived all over the earth already in continents that likely did not sink when Atlantis sunk why would he need an ark unless he was bringing them from Maldek (now the asteroid Belt) or Mars?

It's just like now. How many continents don't have sheep or goats or cows? None. They might not have a platypus or kangaroo but they all have horses, goats, sheep and cows of one kind or another right now. So, if one continent sunk like Atlantis and Mu did there still would be horses, cows, sheep and goats and dogs and cats everywhere else at the very least.