( ( if ( ( the bird ) ( ( is not ) there ) ) ) ( , ( ( the wings ) ( ( ( will not ) ( be there ) ) . ) ) ) )
(ROOT (S (SBAR (IN if) (S (NP (DT the) (NN bird)) (VP (VBZ is) (RB not) (NP (RB there))))) (, ,) (NP (DT the) (NNS wings)) (VP (MD will) (RB not) (VP (VB be) (ADVP (RB there)))) (. .)))
if the bird is not there, the wings will not be there.
(ROOT (S (NP (NP (DT The) (NN bird) (NN ancestor)) (SBAR (WHNP (WDT that)) (S (VP (VBD lived) (PP (IN in) (NP (NNS trees))))))) (VP (VBD developed) (NP (NP (NNS wings)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB commonly)) (VP (VBN associated) (PP (IN with) (NP (NNS birds))))))))) (. .)))
The bird ancestor that lived in trees developed wings, which is commonly associated with birds.