I'd say that alot of animals are alot more intelligent than we give them credit for.
Most 'smart' animals are self-aware and use the environment to their advantage (apes and tools, birds and poking sticks (for food inside trees) ).
It's fun to watch documentaries on kids as they get older (as their brain capacity increases), especially around the time that the learn to infer knowledge, or as they can predict what will happen, and use abstract thinking to determin results. And their ability to lie for self-presivation... That's always a kicker!
A good one is for the babies, you show an object, then hide it under a cup - To them, it just suddenly ceased to exist! As they get older, the kids are all "What? That's supposed to impress me? That thing's still under there, just because I can no longer actually tell it's there, I know there's no-where else for it to go! Now... Lemme play!"
A Parrot that can mimic language..?
I'm not sure if it's understanding, or if it's simply repeating for the reward. At any rate, I wouldn't be surprised (but most definatly
wowed) if birds do hold a style of intelligence comparable to our own (and Dolphin's of course!)
Ahh, the wonders of nature, how beatiful she is.