Hey guys, Tara here for Dnews - and if you’ve been on the internet the past few days, then

you might’ve seen this story about Koko the gorilla mourning the death of Robin Williams.

Koko is part of California’s Gorilla Foundation, and she’s well-known for her fluency in

English. She’s capable of signing and communicating over 1,000 words in English.

Back in 2004, Williams visited Koko to film a PSA for the foundation - and the two developed

a special bond. So earlier this week, when Koko heard of his passing, photos surfaced

on the internet showing her emotional reaction to hearing the news. According to her caretakers,

she became incredibly somber - quivering her lip, and signing the words “woman” and

“cry.”

Now aside from being horribly sad, part of the reason this story is gaining so much attention

- is that a lot of us out there assume that humans are the only animals capable of empathy.

Primate researchers will tell you differently, but it’s still a widely-debated topic. And

a new study, published this week in PeerJ, aims to examine the relationship between human

empathy and empathy of apes.

Specifically, they looked at bonobos - which are our closest evolutionary cousins - and

they examined them under the context of emotional contagion. It’s the ability to transfer

your emotions to another person using facial expressions, and it’s widely considered

to be the most basic form of empathy.

One of the most trivial forms of that, can be seen in the phenomenon of yawn contagion

- or contagious yawning. Interestingly, humans and bonobos are the only two species where

yawn contagion seems to follow an empathic trend - meaning it’s more likely to occur

between individuals who share a strong emotional bond. Which is another reason they chose bonobos

for this study.

Over the course of five years, a team of researchers observed both humans and bonobos doing everyday

activities, and they took note of how many times each individual responded to another’s

yawns, and how quickly it took them to respond.

It turns out, that in cases where the yawner and the responder were NOT friends, bonobos

responded just as quickly to another’s yawns, as humans did. Meaning emotional contagion

may be just as prominent in bonobos, as it is in humans.

HOWEVER. In cases where the yawner and the responder were close, or had a strong bond

- humans still reacted more quickly to someone else’s yawn, than bonobos. Researchers believe

this might be due to the complex emotional foundations that human relationships are built

on - but it still highlights an important conclusion of this study. Which is that when

it comes to empathy, a close relationship between individuals is more important, than

their species.

The Robin Williams story is a good example of that - but there’s an even better one,

involving the same gorilla, Koko - adopting a kitten, caring for it for many months, and

then expressing deep sadness when she learned the kitten died. That story has since been

adapted into a children’s book - and it’s a poignant example of the deep emotional bonds

that can exist between two individuals, even those of wildly different species.

I’m sure some of you out there have pets, or similar stories of bonds you’ve developed

with other animals. If so, feel free to share them in the comments below - and as always,

thank you guys for watching!