Lil Bub is a celebrity cat who was born on June 21, 2011. The runt of her litter, she was born with several genetic mutations, including having a shorter lower jaw (causing her tongue to always hang out), no teeth, and dwarfism. She also suffers from the bone disorder osteopetrosis and is polydactyl, having an extra toe on each paw. She gained fame on the internet after her owner, Mike Bridavsky, posted pictures of her on Tumblr. She frequently makes appearances for charity and has traveled to promote her book "Lil Bub's Lil Book: The Extraordinary Life of the Most Amazing Cat on the Planet", her documentary "Lil Bub & Friendz", and her record Science & Magic. A portion of all profits made on her merchandise sales goes to animal rescue groups.