During avian evolution, the loss of the CFL and reorganization of the pelvic musculature [5], [13] could have made birds unable to properly carry a postacetabular mass equivalent to that carried by non-avian theropods [5], [6].
1	During	during	ADP	IN	_	3	case	3:case	Discourse=context-background:90->95:2
2	avian	avian	ADJ	JJ	Degree=Pos	3	amod	3:amod	Entity=(145-event-new-cf10-2-sgl
3	evolution	evolution	NOUN	NN	Number=Sing	25	obl	25:obl:during	Entity=145)|SpaceAfter=No
4	,	,	PUNCT	,	_	3	punct	3:punct	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	6:det	Entity=(146-event-new-cf6-2-sgl
6	loss	loss	NOUN	NN	Number=Sing	25	nsubj	25:nsubj	_
7	of	of	ADP	IN	_	9	case	9:case	_
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	9:det	Entity=(48-object-giv:inact-cf2-2-coref
9	CFL	CFL	NOUN	NN	Number=Sing	6	nmod	6:nmod:of	Entity=48)146)
10	and	and	CCONJ	CC	_	11	cc	11:cc	_
11	reorganization	reorganization	NOUN	NN	Number=Sing	6	conj	6:conj:and|25:nsubj	Entity=(147-event-new-cf11-1-sgl
12	of	of	ADP	IN	_	15	case	15:case	_
13	the	the	DET	DT	Definite=Def|PronType=Art	15	det	15:det	Entity=(148-object-new-cf9-3-sgl
14	pelvic	pelvic	ADJ	JJ	Degree=Pos	15	amod	15:amod	_
15	musculature	musculature	NOUN	NN	Number=Sing	11	nmod	11:nmod:of	Entity=148)147)
16	[	[	PUNCT	-LRB-	_	17	punct	17:punct	Discourse=explanation-evidence:91->90:0|SpaceAfter=No|XML=<ref>
17	5	5	NUM	CD	NumForm=Digit|NumType=Card	6	dep	6:dep	Entity=(12-abstract-giv:inact-cf1-1-coref)|SpaceAfter=No
18	]	]	PUNCT	-RRB-	_	17	punct	17:punct	SpaceAfter=No|XML=</ref>
19	,	,	PUNCT	,	_	21	punct	21:punct	_
20	[	[	PUNCT	-LRB-	_	21	punct	21:punct	SpaceAfter=No|XML=<ref>
21	13	13	NUM	CD	NumForm=Digit|NumType=Card	6	dep	6:dep	Entity=(149-abstract-new-cf12-1-sgl)|SpaceAfter=No
22	]	]	PUNCT	-RRB-	_	21	punct	21:punct	XML=</ref>
23	could	could	AUX	MD	VerbForm=Fin	25	aux	25:aux	Discourse=same-unit_m:92->90:1
24	have	have	AUX	VB	VerbForm=Inf	25	aux	25:aux	_
25	made	make	VERB	VBN	Tense=Past|VerbForm=Part	0	root	0:root	_
26	birds	bird	NOUN	NNS	Number=Plur	25	obj	25:obj	Entity=(150-animal-new-cf7-1-sgl)
27	unable	unable	ADJ	JJ	Degree=Pos|Polarity=Neg	26	amod	26:amod	_
28	to	to	PART	TO	_	30	mark	30:mark	_
29	properly	properly	ADV	RB	Degree=Pos	30	advmod	30:advmod	_
30	carry	carry	VERB	VB	VerbForm=Inf	27	xcomp	27:xcomp	_
31	a	a	DET	DT	Definite=Ind|PronType=Art	33	det	33:det	Entity=(151-abstract-new-cf8-3-coref
32	postacetabular	postacetabular	ADJ	JJ	Degree=Pos	33	amod	33:amod	_
33	mass	mass	NOUN	NN	Number=Sing	30	obj	30:obj	Entity=151)
34	equivalent	equivalent	ADJ	JJ	Degree=Pos	33	amod	33:amod	_
35	to	to	ADP	IN	_	36	case	36:case	_
36	that	that	PRON	DT	Number=Sing|PronType=Dem	34	obl	34:obl:to	Bridge=151<152|Entity=(152-abstract-acc:inf-cf5-1-sgl
37	carried	carry	VERB	VBN	Tense=Past|VerbForm=Part	36	acl	36:acl	Discourse=elaboration-attribute:93->92:0
38	by	by	ADP	IN	_	40	case	40:case	_
39	non-avian	non-avian	ADJ	JJ	Degree=Pos|Polarity=Neg	40	amod	40:amod	Entity=(87-animal-giv:inact-cf3-2-coref
40	theropods	theropod	NOUN	NNS	Number=Plur	37	obl:agent	37:obl:agent	Entity=87)152)
41	[	[	PUNCT	-LRB-	_	42	punct	42:punct	Discourse=explanation-evidence:94->90:2|SpaceAfter=No|XML=<ref>
42	5	5	NUM	CD	NumForm=Digit|NumType=Card	25	dep	25:dep	Entity=(12-abstract-giv:act-cf1-1-coref)|SpaceAfter=No
43	]	]	PUNCT	-RRB-	_	42	punct	42:punct	SpaceAfter=No|XML=</ref>
44	,	,	PUNCT	,	_	46	punct	46:punct	_
45	[	[	PUNCT	-LRB-	_	46	punct	46:punct	SpaceAfter=No|XML=<ref>
46	6	6	NUM	CD	NumForm=Digit|NumType=Card	25	dep	25:dep	Entity=(13-abstract-giv:inact-cf4-1-coref)|SpaceAfter=No
47	]	]	PUNCT	-RRB-	_	46	punct	46:punct	SpaceAfter=No|XML=</ref>
48	.	.	PUNCT	.	_	25	punct	25:punct	_
