Table 4.

Morphological traits among the eye muscles of birds. Size comparisons for the rectus muscles are mainly based on their size at the point of insertion

	Sparrow	Turkey	Tinamou	Pigeon	Pigeon
Fig. 16	a	b	c	d	f
Ref	Slonaker 1918	Harvey et al. 1968	Elzanowski 1987	Chard and Gundlach 1937	Our digital segmentation
	[99]	[108]	[115]	[102]	na
size of the mObDo relative to the mRecDo	similar	twice as wide	twice as wide	wider	wider
size of m. RecLa vs mRecMe	larger	smaller	smaller	smaller	smaller
location of the insertion of the mRecVe relative to the insertion of the mPyrMemNic	level	lateral	far lateral	lateral	lateral
extent of overlap by the mRecVe of the origin of the mPyrMedNic	~ 100%	~ 40%	< 5%	~ 40%	~ 40%
size of the mRecDo vs mRecVe	similar	smaller	larger	larger	larger
location of the insertion of the mObVe relative to the insertion of the mRecVe	far lateral	lateral	lateral	far lateral	lateral
extent of overlap by the mObVe of the origin of the mRecVe	< 5%	~ 70%	~ 70%	< 5%	~ 50%
proximity of the insertion of the mRecMe to the mObDo	distant	very close	close	very close	distant?
Location of the insertion of the mRecDo relative to that of the mQuMemNic	aligned at lateral edges	aligned at lateral edges	aligned at medial edges	aligned at lateral edges	aligned at lateral edges
mRecMe > mRecLa	no	no?	yes	yes	yes
mRecMe > mRecDo	no	yes	no	yes	yes
mRecMe > mRecVe	no	no?	yes	yes	yes
mRecDo > mRecVe	no	no	yes	yes	yes
mRecDo > mRecLa	no	no	yes	no	no
mRecLa > mRecVe	slightly	slightly	slightly	slightly	slightly
m. Palpebrae Obliquus (m. LevPalOb)	absent	Not reported	present	Not reported	absent