The influence of the presence of capped brood on the behavior of individually isolated nurse bees in the laboratory (Exp. 4). The video shows the behavior of representative bees without (Bee #14, left) or with (Bee #15, right) brood. The recording was carried out during the day at 10:40. In the absence of brood, the bee walks around the nest periphery. In the presence of brood, the nurse stays mostly on the brood-comb at the center of the cage, inspects and tends the wax-caps with her antennae and mouthparts.