In Genesis, two animals of each kind deemed unclean entered Noah's Ark.
Genesis 7:2 instructs Noah to take seven pairs of every clean animal, but only one pair—male and female—of animals considered unclean. Genesis 7:8–9 then describes animals entering the Ark in pairs, male and female, according to the categories given in the command.
The distinction between clean and unclean animals is often discussed alongside later Israelite dietary laws, especially those in Leviticus. Genesis does not provide a complete species-by-species list in the Ark passage. It presents the categories as part of the instructions before the Flood.
A common mix-up is to answer “seven” for every animal. Seven pairs apply to clean animals in Genesis 7:2, while unclean animals are represented by one male-female pair. Some translations phrase the clean-animal instruction as “seven” rather than “seven pairs,” creating an additional translation issue, but the unclean figure is consistently a pair.