https://www.reddit.com/r/Awwducational/comments/819i0c/female_rabbits_have_up_to_an_80_chance_of/
origin - https://www.pipiscrew.com/2018/03/female-rabbits-have-up-to-an-80-chance-of-developing-cancer-if-they-are-not-spayed-by-the-age-of-4/ female-rabbits-have-up-to-an-80-chance-of-developing-cancer-if-they-are-not-spayed-by-the-age-of-4