animal wildlife

i'm planning to travel to patagonia with a friend after we finish our graduation (we're both vet. med students), and we are still in the proccess of researching, but we keep wondering where are the best places/cities to get in contact with wildlife? terrestrial and/or marine, it doesn't matter. is ushuaia and el calafate good places for that? or is there a more specific region? is there a better season too? it doesn't need to be touristy, we'd also prefer that, if possible.

also, is there any travel company (argentina and/or chile) y'all recommend? we're from brasil, so it's easy to get in touch and i believe it'll be cheaper for us too. thank you so much!