Since we can't prove the ability to be self-aware without some hard evidence, at least I don't think any of the current tests "prove" it, we have issues with ranking animals. This is a decent list, at least it shows a good view on the current thoughts behind intelligence.
Also, the elephant one is a little creepy. Though they could have been taught to do that specific design. I'm under the impression that they weren't, which shows something amazing. Though some primates have done the same thing, it's just more fascinating with an elephant because they have multiple handicaps.
 K, so scratch orangutang with Ape, but still a primate. Dolphin would probably fall next or equal, as well as elephant could possibly be 3rd. Crows are known to be extremely intelligent, something most people don't know. Though I think her list gets more and more biased after that. lol that was a poor, my bad.
The ape is thought of as the smartest. I could get peer review articles but that's too much work.Edited by mushroomboy - 5/12/11 at 9:37am