Most folks know the story of Noah. How God warned him about an upcoming flood that would last for 40 days and 40 nights. To preserve nature, Noah took two of every animal onto his Ark in readiness for breeding once the storm had passed.
However, you could also look at it another way. If a cow died, Noah would still have had one cow left for beef and milk. He and his family wouldn’t starve, and they could come back to land and start afresh.
Moral of the story? Always have a back-up plan.