Genesis 7:8

Of clean beasts, and of beasts that are not clean, and of fowls, and of every thing that creepeth upon the earth,

1. Clean and unclean beasts, birds, and all creeping things entered the ark also. (I'm not certain why the author continues to emphasize the different categories of animals that entered the ark. It could be for symbolic purposes, such as to show that all people and animals, regardless of class or category, will be preserved through death that was brought on by Adam and Eve. However, nothing about that is mentioned.)