An early animal shelter is often referred to as an ARK, which is a three-letter word. An ARK is a large boat or ship that was used in the Bible to save Noah and his family from a great flood. In modern times, the term ARK has been used to refer to any type of shelter for animals, particularly those that are endangered or in need of protection. Animal shelters provide a safe place for animals to live and receive care, such as food, water, and medical attention.