Genesis 6:
20 Two of every kind of bird, of every kind of animal and of every kind of creature that moves along the ground will come to you to be kept alive.
Was Noah's flood global?
No, according to
Barnes:
For the sake of Noah, the animal species also shall be preserved, "two of each, male and female." They are to come in pairs for propagation. The fowl, the cattle, the creeping thing or smaller animals, are to come. From this it appears that the wild animals are not included among the inmates of the ark. ... As the deluge was universal only in respect to the human race, it was not necessary to include any animals but those that were near man, and within the range of the overwhelming waters. Fodder and other provisions for a year have to be laid in.
Did Noah have marsupial kangaroos in the ark?
No, according to Barnes, it was not a worldwide flood but it looked like one to Noah. As far as Noah could tell, his world died. For all intents and purposes of the redemption story, it was a catastrophic/global event: all humans died except Noah's family. That's the point.
National Center for Science Education gives more detailed calculations:
Because of the curvature of the earth, the horizon drops from where the viewer is standing. However, the drop is proportional to the square of the distance between the viewer and an object on the horizon (Young nd). From these relationships, it can be seen that a tribal chief (or Noah) standing on the deck of a large boat (Ark), perhaps 7.8 meters above the water, would not be able to see the tops of any hills as high as 15 m from as little as 24 km away across flood plains covered with water because the curvature of the earth prevents it (See the Appendix for examples of calculations). Most hills in this region that are as much as 15 m high are more than 95 km away from the river levees. Therefore, the survivors of the Flood could see only water in all directions while they were floating down the Tigris River and over the flood plains. Many of these hills would also be partly covered with water which would make their tops project less above the water level, and therefore, the curvature of the earth would make them disappear from the line of sight in even a shorter distance than 24 km.
There is also a parallel
Babylonian Story of the Flood written in about 1750 BC. Both stories called for a worldwide flood to destroy mankind. Even though the flood wasn't global, all humans in the world were killed except Noah's family.