Why didnt they go extinct after the flood when there was nothing to eat or drink?
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They remained on the ark for months, they couldn't really walk on water, except for ducks which might of got an early out for a cruznhappy..
"Now in the six hundred and first year, in the first month, on the first day of the month, it came about that the waters had drained from off the earth; and Noah proceeded to remove the covering of the ark and to look, and here the surface of the ground had drained dry. 14 And in the second month, on the twenty-seventh day of the month, the earth had dried off." Ge8:13