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O. volvulus is transmitted by sandflies, and their role in the transmission of onchocerciasis was discovered by the Scottish parasitologist Breadablane Blacklock in Sierra Leone in the mid-1920s (19). There are accounts of the history of onchocerciasis by Grove (105) and Muller (192).
Protoceratops was discovered during the 1920s, in the Gobi desert, in Gansu, Inner Mongolia. Many skeletons were discovered by the American expedition. the type species, P. andrewsi, was formally described by Granger and Gregory in 1923.t is notably larger than P. andrewsi. In the 1920s, Roy Chapman Andrews discovered the first known fossilized dinosaur eggs, in the Gobi Desert of Mongolia. Due to the proximity of Protoceratops, these eggs were believed at the time to belong to this species.