The questions assumes anything OTHER than a human ofcourse, and limit your answers to real creatures, not fictional or mythological. Feel free to offer your reasoning if you like.
I'd be a bald eagle. Life is awesome when your a free bird. Your just flying around the world, the wind on your face. I would also like to be a snake or wolf.
I'd love to be any type of big bird, preferably albatross but I wouldn't mind, I'd love to experience what it's like to fly with the wind in your face.
I'd like to be something like a dolphin, living underwater would be something that I'd find interesting as long as there is no pollution in the water, it would be alright for me.
A male lion. They sleep most of the day and the only real work that they have to do is protect their family and sometimes go out hunting. The lioness usually goes out hunting.
And by being a male lion, you're at the top of the food chain for animals, mostly.