1960

In Goodall’s first year of study, she observed David Greybeard eating a dead animal. This was proof that chimps eat meat.

1960

Goodall observed David Greybeard making and using a tool to find and eat termites.

1964

A chimp named Figan showed planning when he “kidnapped” a chimp named Flint to get the others to follow him to a new location.

1964

A chimp named Mike showed intelligence by using empty kerosene cans to create a noisy charging display. He banged the cans together to scare larger males.

1970

The sight of a waterfall inspired the chimps to perform a joyful and spontaneous dance.

1974

In a shocking development, “war” broke out between two groups of chimps. The war lasted four years.

1975

Figan’s status as a leader was strengthened by his close relationship with his brother, Faben. When Faben disappeared, Figan had a harder time staying on top.

1987

After three‑year-old Mel’s mother died of pneumonia, he was “adopted” by a female chimp called Spindle. This was the first time that a nonrelated chimp was observed to adopt an orphan youngster.

1994

The use of twigs to catch carpenter ants had been seen in only one chimp community. After one chimp left that community for another, she began teaching the skill to chimps in her new community.

1995

Research suggests that some chimps swallow the leaves of a particular plant to help stop stomach pain or get rid of parasites.