Hibernation is natural, and a necessity for snakes that are going to be bred.
1	Hibernation	hibernation	NOUN	NN	Number=Sing	3	nsubj	3:nsubj|7:nsubj	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	3:cop	_
3	natural	natural	ADJ	JJ	Degree=Pos	0	root	0:root	SpaceAfter=No
4	,	,	PUNCT	,	_	7	punct	7:punct	_
5	and	and	CCONJ	CC	_	7	cc	7:cc	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	7:det	_
7	necessity	necessity	NOUN	NN	Number=Sing	3	conj	3:conj:and	_
8	for	for	ADP	IN	_	9	case	9:case	_
9	snakes	snake	NOUN	NNS	Number=Plur	7	nmod	7:nmod:for|12:nsubj|15:nsubj:xsubj	_
10	that	that	PRON	WDT	PronType=Rel	12	nsubj	9:ref	_
11	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	12	aux	12:aux	_
12	going	go	VERB	VBG	Tense=Pres|VerbForm=Part	9	acl:relcl	9:acl:relcl	_
13	to	to	PART	TO	_	15	mark	15:mark	_
14	be	be	AUX	VB	VerbForm=Inf	15	aux:pass	15:aux:pass	_
15	bred	breed	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	12	xcomp	12:xcomp	SpaceAfter=No
16	.	.	PUNCT	.	_	3	punct	3:punct	_
