I don't know about bears, but I wouldn't it put it past a bonobo...

Edit: Dolphins are also famously kinky and some of them would probably do it if they could.

I believe there was recently a discovery of chimps shoving grass up their butts so the tips hang out the end.

Some random traveler:
My milk is so far spoiled it has gone solid. But I can't let it go to waste!

Achievement unlocked Discovered cheese

Technically we don't know what every bear has or hasn't done

Elephants would probably try it but they can't reach, so they get a friend to help

I think animals are wise enough to understand most things don’t have a flared base

I don't think even humans want to do that.

For most animals with claws or hooves it would be extremely hard to do that without hurting itself in the process