Tree swallows are nesting nine days earlier.
1	Tree	tree	NOUN	NN	Number=Sing	2	compound	2:compound	_
2	swallows	swallow	NOUN	NNS	Number=Plur	4	nsubj	4:nsubj	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	aux	4:aux	_
4	nesting	nest	VERB	VBG	Tense=Pres|VerbForm=Part	0	root	0:root	_
5	nine	nine	NUM	CD	NumForm=Word|NumType=Card	6	nummod	6:nummod	_
6	days	day	NOUN	NNS	Number=Plur	7	obl:npmod	7:obl:npmod	_
7	earlier	early	ADV	RBR	Degree=Cmp	4	advmod	4:advmod	SpaceAfter=No
8	.	.	PUNCT	.	_	4	punct	4:punct	_
