Which are the best wildlife spots?

Just want to know a couple of the best wildlife spots for photography. Could you include the country and types of animals i could see if i went there. thanks!





P.S. I've only been to South Africa and Zimbabwe for wildlife so far (i didn't see a leopard :( that was my goal) , but i want to see something more, like western wildlife e.g. grizzlies or something.Which are the best wildlife spots?
Yellowstone National Park. I was listening to the news and they said the reintroduction of the wolf lead to more beaver. I didn't quite follow their logic, but they said elk now are too afraid to approach the waters edge, a great ambush spot for wolves and defenseless place to be for running. So the elk can't eat all these plants beavers rely on. Grizzlies might be rare there, however, so perhaps Alaska instead. Bring a warm winter jacket though.