Definition: The hind portion of an animal's body, located below the rib cage in mammals and below the thorax in arthropods. In mammals, the abdomen contains the viscera excluding the heart and lungs.
Sources:
- Burnie D, Wilson DE. 2001. Animal. London: Dorling Kindersley. 624 p.
- Keeton, W.T. and J.L. Gould. 1986. Biological Science (4th Edition). New York: W.W. Norton & Co Ltd.
