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  1. Instructions Upon opening the file, if you see a RED X on the last slide, click the OPTIONS box on your security warning and select ENABLE THIS CONTENT. Then start the slide show to enable the 3D view. Rotate the model by holding the LEFT click button and dragging with your mouse. Zoom in and out by holding the RIGHT click button and dragging your mouse up and down. Translate the model by holding both RIGHT and LEFT buttons and dragging your mouse. All 3DCT models are not shown to scale. Experiment your viewing experience by clicking the MENU button and turning various options on and off. Click ESC to exit from viewing the 3D model slide.

  2. Old World monkeys are primates and are more closely related to humans and apes than any other living nonhuman primate group. The Smithsonian Institution’s Division of Mammals ( houses many Old World monkeys in its scientific collections. This type specimen, USNM 123993 (, is a male dusty leaf monkey (Trachypithecus obscurus carbo) from Thailand. This specimen was collected by William Abbott in 1903 near Pulo Terutan, located in the Satun Province. This individual weighed 18.75 lbs, had a total length of 1,330 mm, a tail length of 810 mm, and a head to body length of 520 mm. In 1913, G. S. Miller designated this individual the type specimen of Presbytis corvus. This is a CT scan of the mandible of USNM 123993. These three-dimensional scans are made publicly available through the generous support of the Smithsonian 2.0 Fund, provided from the annual gifts of the Smithsonian National Board to the Secretary to use at his discretion (, and the Smithsonian Collections Care and Preservation Fund. The main goal of this joint initiative between the Human Origins Program and the Division of Mammals is to make the NMNH's scientific collections of our closest living relatives, the apes, available in 3D for education and research. These slides can be used for educational purposes only. For all other uses, please contact the Human Origins Program at or