( Birds ( ( ( need ( a ( light-weight body ) ) ) ( ( in order ) ( to ( stay aloft ) ) ) ) . ) )
(ROOT (S (NP (NNP Birds)) (VP (VBP need) (NP (DT a) (JJ light-weight) (NN body)) (SBAR (IN in) (NN order) (S (VP (TO to) (VP (VB stay) (ADVP (RB aloft))))))) (. .)))
Birds need a light-weight body in order to stay aloft.
(ROOT (S (NP (NNP Birds)) (VP (VBP need) (NP (DT a) (JJ light-weight) (NN body)) (PP (IN for)) (S (VP (TO to) (VP (VB stay) (ADVP (RB aloft)))))) (. .)))