The Biodiversity Heritage Library is a vast digital library containing literature on biodiversity. It was formed in 2005 by major natural history institutions to make biodiversity literature openly accessible online. The library aims to digitize and provide free access to literature that is typically scattered in various physical libraries. It addresses the long half-life of publications in taxonomy and the need for students and researchers to access original references. The founding institutions include the American Museum of Natural History, Natural History Museum, and others. The library utilizes permissions and open access to digitize content and allows for reuse through sites like Encyclopedia of Life.