 Populations of Bengal and Sunda slow lorises are not faring well in zoos . Of the 29 captive specimens in North American zoos in 2008 , several are hybrids that cannot breed , while most are past their reproductive years . The last captive birth for these species in North America was in 2001 in San Diego . Pygmy slow lorises are doing better in North American zoos ; from the late 1980s ( when they were imported ) to 2008 , the population grew to 74 animals , with most of them born at the San Diego Zoo . 
