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thought lemurs weren't capable of doing a lot of things that other primates were and the cognitive domain. in some ways this is surprising. >> reporter: what else surprised professor brannon? that lemurs like humans avoid risk. >> we found out they don't like to gamble. >> reporter: because in this test they're told if they photograph the picture of the train they could get a bunch or possibly no pellets at all but if they choose the safe option, the flag photo, they always get one pellet. brannon says lemurs are smart enough to make an association between the photograph and the outcome. there are exceptions. but even when the risky choice will sometimes deliver more treats, most lemurs prefer the safer option, the photo that guarantees them one treat. >> even if we give them six,