Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. House cats are now on the world's top 100 invasive species list. Unlike the other species like the white shark, the grizzly and the Tyrannosaurus rex, the house cat does not look threatening yet they are as dangerous as the mentioned creatures. Being carnivorous by nature, the house cats have proved to be a stone-cold killer. The Nature Communications have said that they has as aim to reduce the cat population by preventing them from continually reproducing within the community. Moreover, the Nature Communications have sensitized the public about the importance of feeding their cats within their household! Other researchers have underlined the importance of keeping the house cats indoors. The house-keepers are given much explanation about their roles towards their cats, that is, to always fulfill their duty as a pet keeper by feeding their cat properly, giving it specific shelter within the house, playing with it and so on...