Table 2. Performance per bird in the water tube experiments (3–6).

The number of stone dropping training trials needed to reach proficiency, and the number of correct choices out of the total number of choices made and p-values from Bonferroni-Holm corrected (within experiment) binomial tests for each experiment (−, was not given this experiment).

Bird (color rings)	Sex	Stone drop training trials	Heavy vs. light	Heavy vs. light magic	Wide vs. narrow equal
Tequila (YP)	M	192 push/233 drop	33/43	19/30	–
			0.003 (heavy)	0.60
Margarita (PB)	F	362	41/49	17/56	–
			0.00001 (heavy)	0.02 (heavy)
Cerveza (BO)	F	252	36/55	10/39	1.00
			0.06	0.02 (heavy)
Michelada (OR)	F	–	–	–	–
Batido (OP)	M	179	38/51	28/37	1.00
			0.002 (heavy)	0.02 (heavy)
Horchata (GR)	F	135	18/32	16/32	–
			0.60	1.00
Refresco (PY)	M	204	46/67	17/35	1.00
			0.009 (heavy)	1.00
Jugo (RB)	M	–	–	–	–

Notes.

Tequila was the first bird tested and I did not realise until after I trained him to pick up and drop the stones into the tube that I wanted to only train the other birds to push the stones into the tube to save training time. Therefore, the trial numbers for the other birds refer to proficiency to push objects into the tube, not pick up and drop them.

Y

Yellow

P

Purple

B

Blue

O

Orange

R

Red

G

Green