Dog owners will no doubt be familiar with these mighty mounds of rubber.
The bear version is no different.
"The Kongs are exactly the same as those used by people with dogs at home," Heidi Quine, a veterinarian team director at Animals Asia, tells The Dodo. "We like to use the ultra-durable black kind here at the sanctuary and they have always proven to be an incredibly popular toy."
Indeed, Angus isn't the only bear at this sanctuary, whose road to a new life seems paved in chewy, plastic balls.
Staff members have been doling out Kongs - donated from the company - to its residents as part of an enrichment program.
The late Jasper, for example, liked to fish his toy out of the pool.