I believe the Hebrew supports the idea of two of every flesh ( everything with the breath of life) male and female. were aboard the Ark.That their were 8 Adamic souls on board (that is only Noah and his family were left with a pure bloodline the blood line Christ would come through ) remember the reason for the flood was the influx of nephelium fallen angels mating with the daughters of men (gen.6) only Noah bloodline was pure.(see Appen. below)The bible being the story of this bloodline from which our savior would come. The races are not our story therefore we have little more said of them Now some believe the flood wasn't world wide we can find some support in the language for this but it 's iffy in my opinion and I find it cause a conflict with some scriptures. A third option is the flood was world wide but some other races survived in small boats these were not ordered built by God (like the ark) but that God allowed some to survive on their own ,but again this isnt our story so its not told this could explain why almost every civilization in history has a flood story with survivorsRead carefully the hebrew explanation from companion Bible of what Noah means SEE ...Appen. 26NOAH "PERFECT". (GEN. 6:9). The Heb. word tamim means without blemish, and is the technical word for bodily and physical perfection, and not moral. Hence it is used of animals of sacrificial purity. It is rendered without blemish in Ex. 12:5; 29:1. Lev. 1:3, 10; 3:1, 6; 4:3, 23, 28, 32; 5:15, 18; 6:6; 9:2, 3; 14:10; 22:19; 23:12, 18. Num. 6:14; 28:19, 31; 29:2, 8, 13, 20, 23, 29, 32, 36. Ezek. 43:22, 23, 25; 45:18, 23; 46:4, 6, 13. Without Spot. Num. 19:2; 28:3, 9, 11; 29:17, 26. Undefiled. Ps. 119:1. This shows that Gen. 6:9 does not speak of Noah's moral perfection, but tells us that he and his family alone had preserved their pedigree and kept it pure, in spite of the prevailing corruption brought about by the fallen angels