Table 1.

Endocranial volume, body mass and EQ of the brains of Neotropical parrots

Species	Specimen No.	ECV (cm3)	BM (g)	EQ
Amazona aestiva	MLP 621	7.237	451	1.642
Amazona vinacea	MACN 1032	8.399	254	2.640
Anodorhynchus hyacinthinus	MACN 2355a	23.715	1331	2.909
Ara chloropterus	MACN 1479a	23.418	1214	3.027
Ara sp.a	MLP 943	15.906	923	2.402
Aratinga leucophthalma	MLP 407	2.932	158	1.207
Cyanoliseus patagonus b	MLP 65	6.383	278	1.906
Enicognathus ferrugineus	MACN 1426a	4.911	160	2.007
Myiopsitta monachus	MLP 79	3.258	120	1.568
Nandayus nenday	MLP 405	4.008	128	1.859
Pionopsitta pileata	MLP 67	2.769	119	1.339
Pionus maximiliani	MLP 343	5.257	293	1.523
Primolius auricollis	MACN 2518	7.780	245	2.496
Pyrrhura frontalis b	MLP 351	2.394	80	1.450
Cacatua galerita	MLP 755	11.604	723.5	2.012

BM, body mass; ECV, endocranial volume; EQ, encephalization quotient.

^aAverage between body mass of all species of Ara.

^bAverage between female and male body mass.