What does it mean to be intelligent or to have emotions?

I think some animals are maybe not the most intelligent animals but they are very emotional.

But I think all animals, all the mammals for sure, and also all the birds, they have quite an

emotionality.

It's Thursday, March 28th, and this is Science Friday. I'm Scifry producer Charles Burgquist.

Primatologist Franz Duval

was a frequent guest on Science Friday over the years,

talking about the behavior and inner life of animal. was a frequent guest on Science Friday over the years,

talking about the behavior and inner life of animals,

particularly chimpanzees.

Dr. Duval died recently at the age of 75.

Here's Ira Fl Plato to remember him.

It wasn't that long ago that scientists didn't think animals could rival humans in terms of

intelligence, emotions, or empathy.

But the groundbreaking work of Franz de Vval helped to change all of that.

Duval spent his lifetime studying the lives of animals, especially our closest cousins,

the chimpanzees. The primatologist died last week at the age of 75, and we wanted to remember

him by sharing one of our favorite conversations with him on the show. It's from 2019 when he published his book Mama's Last Hug, Animal

Emotions and what they tell us about ourselves. In it he tells the story of a female

chimp who didn't produce enough milk to feed her young.

When Duval taught her to feed her baby with a bottle instead, she repaid him with what most of us would recognize as gratitude,

holding both of his hands and whimpering sadly if he tried to leave.

...