Mean percent change from Week 0 daily food hoard ± SE, for Siberian hamsters housed in long daylengths while earning one food pellet per 10 wheel revolutions (○, LD/10REV, initial daily average pellets hoarded (pellets ± SEM) = 97.6 pellets ± 17.5), long daylengths without running wheel contingent food delivery (□, LD/FW, initial daily average pellets hoarded (pellets ± SEM) = 85.4 pellets ± 19.1), short daylengths while earning one food pellet per 10 wheel revolutions (●, SD/10REV, initial daily average pellets hoarded (pellets ± SEM) = 73.9 pellets ± 17.4), or short daylengths without running wheel contingent food delivery (■, SD/FW, initial daily average pellets hoarded (pellets ± SEM) = 86.7 pellets ± 17.4). * indicates significant decrease from initial baseline (Week 0) for SD/10REV, † indicates significant decrease from initial baseline (Week 0) for SD/FW, and ‡ indicates significant decrease from initial baseline (Week 0) for LD/FW. Bracket indicates between group similarity within time point, P<0.05.