The Species Factor!

Today in class, I kept wanting to say something, but I suppose it would be better served here in the hopes that someone constructively replies to it.

We talked a lot about Singer's Moral Circle, its legitimacy as a theory, and all this stuff. However, I would tend to think that I disagree with the circle because it does not account for one very important thing: species.

Is it not too much to assume that we act the way we do because humans are loyal to humans? Just as a bear would kill a wolf to save another bear, I am certain a human would do the same. Is it wrong to compare these? I do not think so at all. All species have this instinct within that makes them loyal (or sometimes disloyal I suppose) to their own species. When given the choice between theirs or yours, it is often most likely the case that they will choose their own.

Now some might say that this is just a stretch and that I cannot place this generalization to mean the same thing for all species. I would respond that they are incorrect and I would base it on Donovan. She asserts that all species are equal. Regardless of whether you agree, it is the assertion. Therefore, we must attribute some sort of likeness to all species. And I believe that "species" in and of itself defines the characteristic that I am pointing out.

So I ask this question: can species bias be attributed to all species? Or do some species not possess such an ability? It puzzles me.