Box-and-whisker plots illustrating DRL performance during each season. Top shows response rate (responses/minute) and bottom shows the behavioral inhibition ratio (reinforcers/responses). Horizontal lines within boxes denote medians (50th percentile); horizontal edges of the boxes denote the 25th and 75th percentiles; whiskers extend to the 5th and 95th percentiles. Open symbols show the outliers. N = 15. Response rates are significantly higher during the migratory periods relative to the non-migratory periods and the behavioral inhibition ratio was significantly lower during migration. Operant data were analyzed for the same weeks, except in fall when operant animals were exposed to photoperiods ranging from 16.0:8LD - 11.5:12.5LD.