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))))))))))))))))) (. .)))
Ducks can never be imprinted.
( Ducks ( ( ( can never ) ( be imprinted ) ) . ) )
(ROOT (S (NP (NNS Ducks)) (VP (MD can) (ADVP (RB never)) (VP (VB be) (VP (VBN imprinted)))) (. .)))