Yep, Brumas was even a big deal out here in Australia. Little kids (as I was then in the 1950s) were told all about it at school.
Getting back to the problem of housing not only polar bears but other big but solitary carnivores, like tigers, is that decent enclosures cost a lot of money and effort. Most zoos therefore have one public display enclosure per species and basically solitary animals are forced to live with each other. If they won't, then each spends every second day locked in an off-exhibit holding den (rotation.)
It also restricts the number of such animals held, usually to just a pair, and is not really conducive to establishing a colony.
Getting back to the problem of housing not only polar bears but other big but solitary carnivores, like tigers, is that decent enclosures cost a lot of money and effort. Most zoos therefore have one public display enclosure per species and basically solitary animals are forced to live with each other. If they won't, then each spends every second day locked in an off-exhibit holding den (rotation.)
It also restricts the number of such animals held, usually to just a pair, and is not really conducive to establishing a colony.