Oh boy, look at what I've done. :)
I had written a big ass reply but the pc froze and it got lost. Yay.
Anyway, my point of humans being like other animals was in reference to the argument about the "goodness" of our nature (are we born good and get corrupted, evil and get saved, etc) and what are "us", as in our beings and what determines that.
Yeah, we're comparatively very intelligent and have a huge impact in the world. Yeah, we're special in that sense (I think if you use special too generally then you have to remember not a single entity, but many, can be "special", whatever that means), even if it's a known fact dolphins and mice are the most intelligent lifeforms on Earth.
And of course we're not just like every other animals, no animal is. But we're all shaped from the same logic, in the same framework, and thus we're not fundamentally different in general terms. When you get more specific though, when you start talking about mammals for example, the specialness of our intelligence too becomes debatable since, for all we know, it's just basically the same thing knocked up a few notches, specially when you look at what makes, biologically, that intelligence, instead of it's manifestation (not that we fully understand it anyway). It's just a "linear" improvement. Maybe impressive, but not necessarily special.
Related to that, we have to realize that even if our technology is, say, a billion times "bigger" than that of chimps, that (obviously) doesn't mean we're that much more intelligent than they are. There are some abilities to which the concept of a critical level is important, and thus arguing our specialness as individuals, as lifeforms, trough the power of our technology is not that good of an idea. For one, that has a lot to do with communication. Keep all our intelligence otherwise and tell me how advanced our technology would be.
Back to my original point, I was trying to argue that much of our needs and wills have motivations that are either similar to that of other animals or can be traced back to similar things, and our decision making, while more elaborate and maybe less direct, is still essentially comparable in what it ultimately seeks, consciously or otherwise.
Kaz argued about the necessity of the psycho-social sciences (in contrast to the supposed lack of such a necessity for other animals). I hope I'm not misunderstood here, but to which extent are they really needed?
You have to remember we were talking about our "natures". One could argue lots, maybe most, of our psychological problems stem from the fact we're so far removed from the environment and way of life that shaped us and in many cases bombarded by impositions and values (say, abstinence) which are completely alien to our physiologies (for lack of a better word). Just as we're not, essentially, the only animals on earth to need nail clippers, it's likely most of these problems we have don't really come from our "selves", but from our current way of life, our current environment. And, guess what. Lots of other animals would have similar problems similar conditions be applied.
So, in that sense, our need for this kind of help argues for a uniformity with many other animals rather than a specialness.
In closing, when it comes to value, we have to keep in mind value is never absolute. If I say that gold is more valuable than a piece of meat (similar masses), people wouldn't argue. And they shouldn't, it's obvious I'm comparing their monetary value on our current market. But if I'm starving in a deserted place, that judgment of values is inverted, and is no less right.
Now, I understand the urge to classify the value of living beings according to their (apparent) "consciousness" (not as much their intelligence), and I'd not think twice between the lives of an apple tree and a man. But it is partial to judge that characteristic, or the dubious honor of being able to wreck Earth like no other species, as the right one to decide value.
In fact, for example, if you take our entire species (and I know I was talking mostly about individuals before, but that was in relation to my original post, and this is another discussion), and judge value from the point of view of the entire biosphere, then it's not hard to see we could even have a negative value, being between, if not the less valuable species in the world.
But I'd still chop that tree down.