(S (S (BASENP (NNS Researchers)) (VP (VBP say) (SBAR (IN that) (S (NP (NP (BASENP (NN poaching)) (S (VP (TO to) (VP (VP (VB use) (NP (BASENP (DT the) (NN rhino) (POS 's)) (NN horn))) (PP (IN in) (BASENP (NN medicine))))))) (CC and) (NP (BASENP (NN encroachment)) (PP (IN into) (BASENP (PRPD their) (NNS habitats))))) (VP (VBP are) (VP (VBG causing) (S (BASENP (PRP them)) (VP (TO to) (VP (VB decline)))))))))) (PERIOD .))