Fallacious yet widespread and documented beliefs courtesy of Wikipedia.
Although common conception says that Noah was told in the Book of Genesis to bring two of each animal onto his ark, the book actually contains differing passages about the number of animals he was told to bring; in Genesis 6:19, he is told to bring "two of all living creatures", while in Genesis 7:2 he is told to bring "seven pairs of every kind of clean animal […] and one pair of every kind of unclean animal" – although in some translations (e.g. the New King James Genesis ) this is rendered as seven animals, rather than seven pairs.