Table 4 Parameter results from two models fitted to growth of first and second chicks, male, and female of normal-sized hyacinth macaws.

Traits	1st chick (n = 294)				2nd chick (n = 87)				Male (n = 148)			Female (226)
Traits		Values	R²	AIC	Values	R²	AIC	F test; p value	Values	R²	AIC	Values,	R²	AIC	F test; p value
Body mass (g)	β0	− 71.43^a	0.953	8883	− 24.01^b	0.965	6815	29.29_{(4, 1198)}; p < 0.0001	− 65.2^a	0.948	3407	− 73.53^a	0.952	3711	12.52_{(4, 760)}; p < 0.0001
	β1	23.29^a			13.51^b				21.54^a			22.94^a
	β2	0.063^a			0.242^b				0.109^a			0.053^b
	β3	− 0.0016^a			− 0.0025^b				− 0.0018^a			− 0.0015^a
Total length (mm)	A	846.8^a	0.968	6577	863.2^a	0.963	1779	24.34_{(3, 1192)}; p < 0.0001	868.2^a	0.969	2518	819.2^a	0.953	2957	1.313_{(3, 763)}; p = 0.2689
	Y0	83.49^a			74.00^b				80.35^a			80.14^a
	k	0.0211^a			0.0202^a				0.0207^a			0.0221^a
Tail (mm)	A	429.5^a	0.948	5895	400.5^a	0.904	1612	27.75_{(3, 1173)}; p < 0.0001	487.8^a	0.932	2382	372^b	0.930	2626	4.110_{(3, 757)}; p = 0.0066
	Y0	0.077^a			0.016^a				0.187^a			0.023^a
	k	0.030^a			0.031^a				0.027^a			0.034^b

Cubic polynomial model (β0 = intercept, β1 = maximum relative growth rate, β2 = upper asymptote, β3 = weight loss begins) and Gompertz model (A = upper asymptote, i.e. predicted adult size), k maximum relative growth rate, Y0 initial value).
*Values follow of different letters are significant to p < 0.05.

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