Common bottlenose dolphins use these important habitats for calving, foraging, and feeding. Megabats fly to roosting and foraging resources. Beetles likewise seem to forage lazily due to a lack of foraging competitors. Avocets tend to prefer habitats with fine sediments for foraging. Workers vary significantly in time spent off the nest, which correlates with foraging efforts. Little pollen has been seen on bees foraging female flowers. Beaver are herbivorous generalists with sophisticated foraging preferences. Africanized honey bees have a set of characteristics with respect to foraging behavior. An example is in his experiments with foraging honey bees. Colonies may vary in the relation between humidity and foraging activity. Social activity comes in a distant third to eating and resting for foraging animals. Its foraging and eating habits are noteworthy in several respects. Predators have a choice of search modes ranging from "sit-and-wait" to "active" or "widely foraging". Money is obtained by growing crops, raising livestock, fishing, mining, and foraging. Bison have usual daily movements between foraging sites during the summer.