We put the baby mallard in a small aviary with the half-grown muscovy, and it worked.
( ( ( ( ( We ( put ( ( the baby ) ( ( mallard ( in ( a ( small aviary ) ) ) ) ( with ( the ( half-grown muscovy ) ) ) ) ) ) ) , ) and ) ( it worked ) ) . )
(ROOT (S (S (NP (PRP We)) (VP (VBD put) (SBAR (S (NP (DT the) (NN baby)) (VP (VBD mallard) (PP (IN in) (NP (DT a) (JJ small) (NN aviary))) (PP (IN with) (NP (DT the) (JJ half-grown) (NN muscovy)))))))) (, ,) (CC and) (S (NP (PRP it)) (VP (VBD worked))) (. .)))
The muscovy adopted the baby mallard as if it was its own baby.
( ( The muscovy ) ( ( adopted ( ( the baby ) ( mallard ( as ( if ( it ( was ( its ( own baby ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN muscovy)) (VP (VBD adopted) (SBAR (S (NP (DT the) (NN baby)) (VP (VBD mallard) (SBAR (RB as) (IN if) (S (NP (PRP it)) (VP (VBD was) (NP (PRP$ its) (JJ own) (NN baby))))))))) (. .)))