Publications

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spontaneous pancreatic islet cell tumor in a black and white colobus monkey (colobus guereza kikuyuensis).a 12-year-old, male black and white colobus monkey (colobus guereza kikuyuensis) from a small community zoo presented with a 6-month history of mild, slowly progressive ataxia and paresis culminating in an acute episode of recumbency, depression, and seizures. the animal was humanely euthanatized. gross post-mortem examination revealed significant abnormalities including diffuse pallor of the carcass and a firm, pale, 8-cm diameter mass, adherent to the serosa of the proximal duodenum and colon, ...200818269522
artificially generated cultural variation between two groups of captive monkeys, colobus guereza kikuyuensis.the majority of studies of social learning in primates have tested subjects in isolation and investigated the effects of learning over very short periods of time. we aimed to test for social learning in two social groups of colobus monkeys, colobus guereza kikuyuensis. subjects were shown video footage of familiar monkeys either pushing or pulling a plastic flap to obtain a food reward, while they were given simultaneous access to the same apparatus. action frequencies showed a significant diffe ...200717049751
primitive neuroectodermal tumor in a two-month-old black and white colobus monkey.a 2-month-old male black and white colobus monkey (colobus guereza kikuyuensis) was euthanatized because of progressive physical deterioration, rear limb paralysis, lymphadenopathy, and the presence of facial and retroperitoneal lumbar masses. at necropsy, soft white masses were present in and around lumbar vertebrae, the subcutis of the face, multiple lymph nodes, and the fourth ventricle of the brain. histologic and immunohistochemical analysis of these masses revealed a primitive neoplasm wit ...19989545136
fatal infections with balamuthia mandrillaris (a free-living amoeba) in gorillas and other old world primates.balamuthia mandrillaris is a newly described free-living amoeba capable of causing fatal meningoencephalitis in humans and animals. because the number of human cases is rapidly increasing, this infection is now considered an important emerging disease by the medical community. a retrospective review of the pathology database for the zoological society of san diego (the san diego zoo and san diego wild animal park) for the period july 1965 through december 1994 revealed five cases of amoebic meni ...19979150541
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