Just how smart are monkeys? Their curiosity leads them to try new things, but it’s their culture that teaches them much of what they know.

Ernest Thompson Seton ventures out to check his baits, slabs of meat laced with poison. He soon finds, however, that Lobo may be smarter than he'd thought.

Sheer nerve, character and intelligence have earned ravens a place in myth and legend. Watch the full episode of Ravens online.

This video-enhanced lesson uses segments from the NATURE program "Ravens" to explore what scientists can determine about animal intelligence. (Grades 9-12)

Human lives have been influenced by animals in matters that reach far beyond the food chain. In surprising ways, animals help teach, heal, and strengthen people -- in body, mind, and spirit.

Segments from NATURE's "Ravens" demonstrate indicators of animal intelligence, including communication, counting, memory, and basic problem solving.

Long recognized as one of the most intelligent birds, the raven also has a less than savory image as a scavenger that does not discriminate between humans and animals.

In Scandinavia, an unattended ice fishing line turns provides an easy meal for a clever raven -- until the frustrated fisherman finally discovers the thief's identity.

Some scientists consider corvids' intelligence to be on par with canids like wolves and dogs, and have conducted investigations into the raven's brainpower.

The bear intimidates with its size and strength, but it may be the bear's undeniable intelligence that causes us to revere the creature even as we fear him.