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Nostril ticks in young chimpanzees in Kibale National Park, Uganda, 2011–2012. A, Thatcher, born in November 2011, with right nostril tick on February 27, 2012. B, Thatcher with a left nostril tick on July 24, 2012. C, Thatcher with both nostrils occluded by ticks on December 2, 2011. D, Betty, born in January 2011, with a left nostril tick on January 23, 2011. Photo credits: Andrew B. Bernard, Ronan M. Donovan, and Jessica A. Hartel.
