enjoy their narcotic effect
... that black lemurs use toxic millipede secretions as insect repellent, and apparently enjoy their narcotic effect?
... that <a href="./Black_lemur" id="mwA5Y" rel="mw:WikiLink" title="Black lemur">black lemurs</a> use toxic <a href="./Millipede" id="mwA5c" rel="mw:WikiLink" title="Millipede">millipede</a> secretions as insect repellent, and apparently <b id="mwA5g"><a href="./Recreational_drug_use_in_animals" id="mwA5k" rel="mw:WikiLink" title="Recreational drug use in animals">enjoy their narcotic effect</a></b>?