If, after you died, you had to live out the lifespan of an animal before being human again, what would it be?

Think about this a sec. The more advanced animals also have longer lives, so it would be more time before being a human. For instance, a dung beetle lives about 90 days. An elephant, about 65 years. Also, take into account that natural selection will prevail. If you are a mouse, your chances of being dismembered by a hawk are good. If you choose a cat, your chances of being a domesticated housecat are not too bad. Your chances are that of any other animal. Very few animals die of old age. Think of quality of life. You will also have the mental capacity of that animal (in otherwords, if you chose to be a rat, you will not think like a human, you would think like a rat). And of course the length of time before being reincarnated as a human again. Think about how animals percieve time as well.