( ( ( Many ( nesting birds ) ) ( in ( ( Canada and ) ( the ( northern ( United States ) ) ) ) ) ) ( ( ( ( fly ( south ( to ( ( the tier ) ( of states ) ) ) ) ) ( along ( ( the Gulf ) ( of Mexico ) ) ) ) ( where ( ( ( ( the ( winter climate ) ) ( is ( more favorable ) ) ) and ) ( food ( is abundant ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Many) (JJ nesting) (NNS birds)) (PP (IN in) (NP (NP (NNP Canada)) (CC and) (NP (DT the) (JJ northern) (NNP United) (NNPS States))))) (VP (VBP fly) (ADVP (RB south) (PP (TO to) (NP (NP (DT the) (NN tier)) (PP (IN of) (NP (NNS states)))))) (PP (IN along) (NP (NP (DT the) (NNP Gulf)) (PP (IN of) (NP (NNP Mexico))))) (SBAR (WHADVP (WRB where)) (S (S (NP (DT the) (NN winter) (NN climate)) (VP (VBZ is) (ADJP (RBR more) (JJ favorable)))) (CC and) (S (NP (NN food)) (VP (VBZ is) (ADJP (JJ abundant))))))) (. .)))
Many nesting birds in Canada and the northern United States fly south to the tier of states along the Gulf of Mexico where the winter climate is more favorable and food is abundant .
(ROOT (S (NP (NP (JJ Many) (NNS species)) (PP (IN of) (NP (NP (NNS birds)) (PP (IN in) (NP (JJ new) (NN england)))))) (VP (VBP fly) (ADVP (RB south) (PP (IN for) (NP (DT the) (NN winter) (NNS months)))) (S (VP (TO to) (VP (VB find) (NP (DT an) (NN environment)) (PP (IN with) (NP (JJR more) (NN food))))))) (. .)))