The Museum of Comparative Zoology, full name "The Louis Agassiz Museum of Comparative Zoology", often abbreviated simply to "MCZ", is the zoology museum located on the grounds of Harvard University in Cambridge, Massachusetts. It is one of three natural history research museums at Harvard whose public face is the Harvard Museum of Natural History. Harvard MCZ's collections consist of some 21 million specimens, of which several thousand are on rotating display at the public museum.