John Chrysostom
The Scriptures inform us that the waters “rose up” above the mountains by “fifteen cubits.” This detail is not without significance; it reveals that all living creatures—humans, livestock, terrestrial animals, as well as the birds of the sky and all other voiceless beings inhabiting the mountains—perished in the deluge. The mention of the waters rising “fifteen cubits” underscores the completeness of God's decree. As He proclaimed, “after seven days I will bring a flood upon the earth, and I will destroy every existing thing that I have created from the face of the earth,” ranging from humanity to livestock, and from creeping creatures to the birds (Gen. 7:4).
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Therefore, the divine narrative serves not only to convey the magnitude of the floodwaters but also to assure us that none survived—not a single beast, livestock, or any other creature—indicating complete destruction alongside humanity. Since all were created for man's sake, their shared fate in demise follows naturally when man faces his end.