Describes the role of mushroom bodies--cup-shaped structures perched atop the brain of an insect--in learning. Mushroom bodies may help fruit flies in learning meaningful odors, cockroaches in spatial learning, and honeybees both in locating pollen and nectar and in navigating back to the colony. (PVD)

Discusses how animals learn from companions, especially among Norway rats. Rats begin early eating foods that other rats eat. Adults also choose to eat a food largely because companions are eating it even if they had learned to avoid the food at an earlier time. Other animals also learn from watching companions' eating techniques, reactions to…

Explores the mathematical abilities of human infants compared with various species of animals. Studies indicate that human infants enter the world capable of doing simple mathematical operations. Nonhuman animals can discriminate among sets of objects based on the number of items in each set. Further studies may pinpoint the age at which children…