Introduction: Inside the Animal Mind: Secrets of the Social World (01:59)

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Elephants, chimpanzees and crows are among the most intelligent animals. Could being a social animal make you more intelligent?

Dolphin Communication Project (02:49)

Kathleen Dudzinski and Kel Sweeting study how dolphins interact and what their relationships are. Dolphins are identified by spot patterns.

Dolphin Bonding (02:29)

Dolphins cement their bonds by touching pectoral fins. It is believed pregnant females create friendships in order to have a support network and babysitters.

Dolphin Group Hunting (01:37)

From an aerial view, we see dolphins working together to corral their prey.

Contact Call Experiment (05:44)

Prof. Karen McComb studies elephant communication in Amboseli National Park. Elephants react defensively when they hear calls from elephants they are unfamiliar with.

John Lilly's Dolphin House (03:47)

Lilly was the first to suggest that dolphins were highly intelligent. Learn about Peter (the dolphin), and research assistant Margaret Howe.

Dolphin Sounds Research (03:19)

Vincent Janik and his team attach a recording tag to a wild dolphin. They intend to match the dolphin's behavior to his sounds.

Echolocation Clicks & Signature Whistle (03:00)

Janik explains the sounds found on the dolphin recording tags. Dolphins have a large adaptable "repertoire," and may be using a completely unique communication system.

Dolphin Evolution (04:28)

Fossil skulls are scanned to see how brain size has changed over time. Archaeocytes were larger animals with smaller brains. The driver of a larger brain may have been social complexity.

Dolphin: Self-Recognition (04:04)

Dolphins make bubble rings and demonstrate self-directed behaviors. Copulating dolphins watch themselves in a mirror.

Human: Self-Recognition (01:11)

Before 18 months, children do not recognize themselves in a mirror.

Chimpanzee Politics (04:19)

In this experiment, a low ranking animal deceives a more dominant group member by waiting to retrieve a hidden banana.

Capuchin Monkey Fairness Test (02:41)

See how one monkey responds when he sees another receive a sweeter reward.

Unique Animal Empathy (03:38)

In this experiment, elephants display an unusual interest in the dead of their own species.

Empathy Crosses Species Barrier (01:42)

In this 2013 video, an entangled dolphin seeks aid from divers.

Final Thoughts: Inside the Animal Mind: Secrets of the Social World (01:35)

Highly social animals realize others have separate thoughts and perspectives, and have the ability to empathize. These traits are driven by the demands of living in groups.

Credits: Inside the Animal Mind: Secrets of the Social World (00:48)

Credits: Inside the Animal Mind: Secrets of the Social World