Figure 5. Distance from the nest's perimeter with respect to behavior and caste.

Younger castes (cell cleaners and nurse bees) slept closer to the center of the nest (i.e., farther from the perimeter) than older castes (food storers and foragers). Bees slept outside cells closer to the perimeter of the nest than when they slept inside cells or were awake, except in the case of foragers, who were active during the day near the nest entrance. Cell cleaners did not sleep outside cells and foragers did not sleep inside cells, hence the absence of relevant bars. These data represent averages for castes calculated from average values per bee (± s.e.m.). Asterisks signify statistically significant differences within castes.