Hm, this is an interesting question. Honestly, I would'nt sure what to do. As much as I love animals and would love to know what it is like to be one... you have to give consideration, with wild animals there is starvation, competition, disease, etc. I feel like some people are under the impression that animals make every kill in every hunt, that ALL/MOST of their young make it to adulthood... and MOST of the time they don't. Sad truth but... nature is cruel, and I'm not so sure I'd want to be subjected to that. So if I could be an animal when I wanted, or for a day, yeah I'd want to do it, most definately. But forever? Im not so sure.
But if I were to be suddenly turned into an animal, I'd focus myself on survival whilst trying to find a way to turn back.... though likely after seeing the world from an animal's perspective, Id likely start to question whether Id want to turn back, mostly because I know that NOBODY would believe me. if I ever made it back.