Final answer:
Anthropoids, including monkeys and apes, have bigger brains on average than prosimians like lemurs and tarsiers. The increased brain size is typically associated with higher intelligence and complex behaviors.
Step-by-step explanation:
Prosimians tend to have relatively smaller brains compared to anthropoids. Anthropoids, which include monkeys, lesser apes, and great apes, have larger brains on average. On average, anthropoids have a bigger brain than prosimians. Prosimians, such as the bush babies, lemurs, lorises, pottos, and tarsiers, tend to be smaller and nocturnal with relatively smaller brains. In contrast, anthropoids, which include monkeys, lesser apes, and great apes, have larger brain sizes. Increased brain size in primates is generally correlated with higher intelligence, more complex social interactions, and sophisticated behaviors. This is reflected in the evolution of human ancestors as well, with species like Homo habilis having considerably larger brains than their primate relatives such as chimpanzees.