This can lead to a condition called imprinting, where the baby grows up thinking it is a people instead of a duck.
( This ( ( can ( lead ( to ( ( a condition ) ( ( ( called imprinting ) , ) ( where ( ( the baby ) ( ( grows up ) ( thinking ( it ( is ( ( a people ) ( instead ( of ( a duck ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (MD can) (VP (VB lead) (PP (TO to) (NP (NP (DT a) (NN condition)) (VP (VBN called) (S (VP (VBG imprinting))) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN baby)) (VP (VBZ grows) (PRT (RP up)) (S (VP (VBG thinking) (SBAR (S (NP (PRP it)) (VP (VBZ is) (NP (NP (DT a) (NNS people)) (PP (RB instead) (IN of) (NP (DT a) (NN duck))))))))))))))))) (. .)))
An issue called imprinting may happen where the duck thinks its a person.
( ( An issue ) ( ( called ( imprinting ( may ( happen ( where ( ( the duck ) ( thinks ( its ( a person ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN issue)) (VP (VBD called) (SBAR (S (NP (NN imprinting)) (VP (MD may) (VP (VB happen) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN duck)) (VP (VBZ thinks) (S (NP (PRP$ its)) (NP (DT a) (NN person))))))))))) (. .)))