CKLD, I even like rats - used to have a pet one called Boris. I know zoos get a bad rap in these more "enlightened" times, and there are appalling zoos but in this country we have pretty good legislation and awareness to make sure animal welfare is paramount. Our place has a zoo licence, not because we are a zoo, but it means we have to conform to the strictest guidelines and we can have surprise inspections at any time. Gerald Durrell once said he would love to see his zoo in Jersey close because it meant it was no longer needed - sadly, humans being what they are, zoos are fast becoming places where they will be the only places animals such as tigers or orangutans exist. Some form of social interaction with zoo animals is now known to be important, not only for enrichment but in order to give them medical or other care without having to sedate them which can be risky. Most is done with a barrier between the animals and people for both side's safety but is great to see.
Yes, the wolves have been given Kongs stuffed with food for enrichment before - we do all sorts to keep their minds active. Laying food trails, giving them problems to solve such as how to get food out of a log, old Christmas trees to pull apart (they like the smell and roll around on them) and going out on their walks. A favourite thing on Wolf Keeper days is to get the clients to build a fake deer out of sticks and a treat-filled sack with a real deer's head on top and them let the wolves loose on it. They knock it to bits in a few minutes and whoever gets the deer head has the prize bit! Then it's fun watching them trying to get the head off whichever wolf has nabbed it. I could watch them all day (and do)!