Table 2. Percentage of trials with persistence in Experiment 2.

Condition	Session of stable period	Pigeon
		W501	G354	W524	W520
Escape optimal	1	0	0	26	0
	2	0	0	16	0
	3	0	0	14	0
	4	0	0	54	0
	5	0	0	5	0
Persistence optimal	1	100	100	83	98
	2	100	100	83	100
	3	100	100	85	100
	4	100	100	82	94
	5	100	100	81	98

Note. Persistence in a trial is defined as completion of that trial (excluding FR 10 trials).