 Until the 1960s , the hunting of slow lorises was sustainable , but due to growing demand , decreased supply , and the subsequent increased value of the marketed wildlife , slow lorises have been overexploited and are in decline . With the use of modern technology , such as battery @-@ powered search lights , slow lorises have become easier to hunt because of their eye shine . Traditional medicine made from loris parts is thought to cure many diseases , and the demand for this medicine from wealthy urban areas has replaced the subsistence hunting traditionally performed in poor rural areas . A survey by primatologist Anna Nekaris and colleagues ( 2010 ) showed that these belief systems were so strong that the majority of respondents expressed reluctance to consider alternatives to loris @-@ based medicines . 
