It has even been proposed that, due to functional convergence, mammals might be a better system to study bipedal dinosaur locomotion [7], [23], but the results reported here show that important aspects of non-avian theropod locomotion can be experimentally recreated in modern birds.
1	It	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	5	expl	5:expl	Discourse=joint-list_m:112->110:1|Entity=(181-abstract-new-cf7-1-cata)
2	has	have	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	aux	5:aux|37:aux	_
3	even	even	ADV	RB	_	5	advmod	5:advmod	_
4	been	be	AUX	VBN	Tense=Past|VerbForm=Part	5	aux:pass	5:aux:pass|37:aux:pass	_
5	proposed	propose	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	0:root	_
6	that	that	SCONJ	IN	_	18	mark	18:mark	SpaceAfter=No
7	,	,	PUNCT	,	_	6	punct	6:punct	_
8	due	due	ADJ	JJ	Degree=Pos	11	case	11:case	Entity=(181-abstract-acc:com-cf7-11-coref
9	to	to	ADP	IN	_	8	fixed	8:fixed	_
10	functional	functional	ADJ	JJ	Degree=Pos	11	amod	11:amod	Entity=(182-abstract-new-cf12-2-sgl
11	convergence	convergence	NOUN	NN	Number=Sing	18	nmod	18:nmod:due_to	Entity=182)|SpaceAfter=No
12	,	,	PUNCT	,	_	11	punct	11:punct	_
13	mammals	mammal	NOUN	NNS	Number=Plur	18	nsubj	18:nsubj	Entity=(183-animal-new-cf8-1-sgl)
14	might	might	AUX	MD	VerbForm=Fin	18	aux	18:aux	_
15	be	be	AUX	VB	VerbForm=Inf	18	cop	18:cop	_
16	a	a	DET	DT	Definite=Ind|PronType=Art	18	det	18:det	Entity=(184-abstract-new-cf9-3-sgl
17	better	good	ADJ	JJR	Degree=Cmp	18	amod	18:amod	_
18	system	system	NOUN	NN	Number=Sing	5	csubj:pass	5:csubj:pass	Entity=184)
19	to	to	PART	TO	_	20	mark	20:mark	Discourse=purpose-attribute:113->112:0
20	study	study	VERB	VB	VerbForm=Inf	18	acl	18:acl:to	_
21	bipedal	bipedal	ADJ	JJ	Degree=Pos	23	amod	23:amod	Entity=(185-event-new-cf11-3-sgl(186-animal-new-cf13-2-sgl
22	dinosaur	dinosaur	NOUN	NN	Number=Sing	23	compound	23:compound	Entity=186)
23	locomotion	locomotion	NOUN	NN	Number=Sing	20	obj	20:obj	Entity=185)181)
24	[	[	PUNCT	-LRB-	_	25	punct	25:punct	Discourse=explanation-evidence:114->112:1|SpaceAfter=No|XML=<ref>
25	7	7	NUM	CD	NumForm=Digit|NumType=Card	18	dep	18:dep	Entity=(43-abstract-giv:inact-cf4-1-coref)|SpaceAfter=No
26	]	]	PUNCT	-RRB-	_	25	punct	25:punct	SpaceAfter=No|XML=</ref>
27	,	,	PUNCT	,	_	29	punct	29:punct	_
28	[	[	PUNCT	-LRB-	_	29	punct	29:punct	SpaceAfter=No|XML=<ref>
29	23	23	NUM	CD	NumForm=Digit|NumType=Card	18	dep	18:dep	Entity=(84-abstract-giv:inact-cf5-1-coref)|SpaceAfter=No
30	]	]	PUNCT	-RRB-	_	29	punct	29:punct	SpaceAfter=No|XML=</ref>
31	,	,	PUNCT	,	_	37	punct	37:punct	_
32	but	but	CCONJ	CC	_	37	cc	37:cc	Discourse=explanation-justify:115->128:2
33	the	the	DET	DT	Definite=Def|PronType=Art	34	det	34:det	Entity=(125-abstract-giv:inact-cf1-2-coref
34	results	result	NOUN	NNS	Number=Plur	37	nsubj	37:nsubj	_
35	reported	report	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	34	acl	34:acl	Discourse=elaboration-attribute:116->115:0
36	here	here	ADV	RB	PronType=Dem	35	advmod	35:advmod	Entity=125)
37	show	show	VERB	VB	VerbForm=Inf	5	conj	5:conj:but	Discourse=attribution-positive:117->118:0
38	that	that	SCONJ	IN	_	48	mark	48:mark	Discourse=same-unit_m:118->115:1
39	important	important	ADJ	JJ	Degree=Pos	40	amod	40:amod	Entity=(187-abstract-new-cf10-2-sgl
40	aspects	aspect	NOUN	NNS	Number=Plur	48	nsubj:pass	48:nsubj:pass	_
41	of	of	ADP	IN	_	44	case	44:case	_
42	non-avian	non-avian	ADJ	JJ	Degree=Pos|Polarity=Neg	44	amod	44:amod	Entity=(172-event-giv:inact-cf2-3-coref(87-animal-giv:inact-cf6-2-coref
43	theropod	theropod	NOUN	NN	Number=Sing	44	compound	44:compound	Entity=87)
44	locomotion	locomotion	NOUN	NN	Number=Sing	40	nmod	40:nmod:of	Entity=172)187)
45	can	can	AUX	MD	VerbForm=Fin	48	aux	48:aux	_
46	be	be	AUX	VB	VerbForm=Inf	48	aux:pass	48:aux:pass	_
47	experimentally	experimentally	ADV	RB	Degree=Pos	48	advmod	48:advmod	_
48	recreated	recreate	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	37	ccomp	37:ccomp	_
49	in	in	ADP	IN	_	51	case	51:case	_
50	modern	modern	ADJ	JJ	Degree=Pos	51	amod	51:amod	Entity=(170-animal-giv:inact-cf3-2-coref
51	birds	bird	NOUN	NNS	Number=Plur	48	obl	48:obl:in	Entity=170)|SpaceAfter=No
52	.	.	PUNCT	.	_	5	punct	5:punct	_
