Still pretty common today.

Look at this fella with no favourite rock

Wearing Jewels is the advanced form of carrying a pet rock.

This is lemmy. Everyone has a favourite rock.

Paleontologists have found Neanderthal stone tools (knapped stone) made with high quality stone taken from kilometers away. This means that they had favorite tools that they wanted to keep with them, while other low quality stones where used few times before being discarded near their collection point

Wasn't that long ago that people even had pet rocks.

I have a favourite rock

Wait... do you guys not have a favourite rock?

Was?

Wait till this guy finds out about the Kaaba

One of my favorite rocks is stoner rock.

Doing volunteer trail maintenance. All the people swarm the tool pile trying to claim their favorite pick mattock or grub hoe. It's adorable.

You don't have a favorite Rock?

It's a mineral, Gurk.

I mean when I was young and used to play with rocks I had a favourite rock, I mean even painting rocks was a thing. No need to go thousands of years back lol

My favorite rock has a first name, it's H-O-M-E-R. My favorite rock has a second name, it's H-O-M-E-R.

Sea otters exhibit this behavior. They keep their favorite rock in their pouches and use them to crack open shellfish.

Don’t mind Geologists

Cats have had domesticated humans for roughly 10,000 years.

Goats have been domesticated for at least 10,000 years.

Dogs have been domesticated for at bare minimum 15,000 years.

People have had their favourite pet animals for much longer than you think.