section_path: Anatomy
section_name: Anatomy
paragraph_text: Anatomy
  
  Marsupials have typical mammalian characteristics—e.g., mammary glands, three middle ear bones, (and ears that usually have tragi, varying in hearing thresholds), true hair and bone structure. However, striking differences including anatomical features separate them from eutherians.
  
  Most female marsupials have a front pouch, which contains multiple nursing teats. Marsupials have other common structural features. Ossified patellae are absent in most modern marsupials (with exceptions) and epipubic bones are present. Marsupials (and monotremes) also lack a gross communication (corpus callosum) between the right and left brain hemispheres.