Table 1.

Initial-link and terminal-link stimuli used in Experiments 1, 2, & 3

Pigeon	Suboptimal Initial Link	Optimal Initial Link	S100.2 Terminal Link	S00.8Terminal Link	O30.2 Terminal Link	O30.8 Terminal Link
Experiment 1
P1	Horizontal Line	Circle	White	Green	Blue	Red
P2	Horizontal Line	Circle	White	Green	Blue	Red
P3	Circle	Horizontal Line	Blue	Red	White	Green
P4	Circle	Horizontal Line	Blue	Red	White	Green
P5	Circle	Horizontal Line	Blue	Red	White	Green
P6	Horizontal Line	Circle	White	Green	Blue	Red
Experiment 2
P1	Triangle	Vertical Line	Yellow	Blue	Red	Green
P2	Triangle	Vertical Line	Yellow	Blue	Red	Green
P3	Vertical Line	Triangle	Red	Green	Blue	Yellow
P4	Vertical Line	Triangle	Red	Green	Blue	Yellow
P5	Vertical Line	Triangle	Red	Green	Blue	Yellow
P6	Triangle	Vertical Line	Yellow	Blue	Red	Green
Experiment 3
P1	Circle	Horizontal Line	Green	Red	Blue	White
P2	Circle	Horizontal Line	Green	Red	Blue	White
P3	Horizontal Line	Circle	White	Blue	Green	Red
P4	Horizontal Line	Circle	White	Blue	Green	Red
P5	Horizontal Line	Circle	White	Blue	Green	Red
P6	Circle	Horizontal Line	Green	Red	Blue	White