Table 1.

Optic lobe, olfactory bulb and brain measurement data for palaeognaths. OLA, optic lobe surface area (cm²); TBA, total brain area (cm²); OptR, ratio of optic lobe surface area to total brain surface area; OBL, olfactory bulb length (longest axis regardless of orientation, cm); CHL, cerebral hemisphere length (longest axis regardless of orientation, cm); OR, olfactory ratio.

		OLA	TBA	OptR	OBL	CHL	OR
elephant bird	Aepyornis maximus	1.42	119.38	0.01	1.17	4.44	0.26
elephant birda	Aepyornis hildebrandti				1.0	4.11	0.24
southern cassowary	Casuarius casuarius	2.99	81.12	0.04	1.13	4.21	0.27
emu	Dromaius novaehollandiae	2.34	52.52	0.04	0.84	3.15	0.27
kiwi	Apteryx sp.	0.24	27.01	0.01	1.2	3.5	0.34
heavy-footed moa	Pachyornis elephantopus	1.29	65.03	0.02	0.78	3.66	0.21
common ostrich	Struthio camelus	2.58	77.09	0.03	0.69	3.91	0.18
greater rhea	Rhea americana	2.08	45.06	0.05	0.74	3.34	0.22
red-winged tinamou	Rhynchotus rufescens	1.01	12.91	0.08	0.24	1.73	0.14
Chilean tinamou	Nothoprocta perdicaria	0.75	8.82	0.09	0.25	1.38	0.18
solitary tinamou	Tinamus solitarius	1.06	13.56	0.08	0.51	1.62	0.31
brown tinamou	Crypturellus obsoletus	0.85	9.97	0.08	0.47	1.46	0.32
lithornithidb	Lithornis plebius				0.56	1.58	0.36

^aOur specimen of A. hildebrandti was missing the dorsal part of the endocranial cavity and so brain area could not be measured.

^bData for L. plebius from Zelenitsky et al. [10].