Smithsonian Institution
National Museum of Natural History: Hall of Mammals: Sumatran Tiger
Brief overview of the Sumatran tiger and accompanying pictures demonstrate why its size and physical characteristics allow this animal to be a dangerous threat to its prey.
The BIG zoo
The Big Zoo: Sumatran Tiger
Virtual Zoo site features some fascinating facts on these large felines. Contains a physical description as well as information regarding their diet, habitat, social structure, birth and offspring and senses.