I'm deliberately not including people.
Also, there can be competing motivations as well as strength of motivation.
No question it can be complex, but I just don't buy the sick nursing cat as an example of any kind of virtue or self-sacrifice.
Bioogical attachment to children seems to be lower in at least some H. sap. compared with, say, bears.
I'm not sure what we are arguing about, or even if we are. I stated what I stated very carefully. The original question, in one of its incarnations, implied that evolution would produce or require unmitigated personal self-interest and would rule out "virtuous" behavior.
If this isn't your position, then I have been posting to the wrong person. There are plenty of people on these threads who claim that belief in evolution would cause a complete lapse of morality. They seem to miss the fact that our moral impulses have survival value, and are indeed rather common in mammals. They certainly aren't rare.