Noah's Ark had two of everything including what feature ?
Your feature part is particularly vague. So I'm not sure how to go about answering that. With that thought in mind, unclean animals settled into the ark by two’s, male and female. However, clean animals, animals approved for sacrifices, entered the ark by 7 pairs. Not everyone knows this. I remember where to find this in the book of Genesis because it is chapter “7” that discusses animals getting on the ark by 7 pairs.