"Like humans, monkeys benefit enormously from being actively involved in learning instead of having information presented to them passively," said Nate Kornell, a UCLA postdoctoral scholar in psychology and lead author of the study, which appears in the August issue of the journal Psychological Science. "The advantage of active learning appears to be a fundamental property of memory in humans and nonhumans alike."
Link for the rest of the article: http://www.sciencedaily.com/releases/2007/08/070801161511.htm