The Diprotodontia (; diprotos, meaning "two front" and οδοντος odontos meaning "teeth") are a large order of about 125 marsupial mammals including the kangaroos, wallabies, possums, koala, wombats, and many others. Extinct diprotodonts include the rhinoceros-sized Diprotodon, and Thylacoleo, the so-called "marsupial lion".