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If anything, morality has a biological basis. Ask yourself why animals (other than humans) can successfully live in complex social groups without there being some sort of instinctive "moral" laws of behavior involved. Chimps, dolphins, wolves, crows, etc.
These groups also learn to change these rules depending on the environment, situation, etc. The young are often taught the consequences of "immoral" acts by their parents, as well as through "play."
Of course, if you believe in some sort of deity, you might say these rules were placed there from some universal knowledge bank, but otherwise it seems fairly clear the rules are dependant on the "experience" of each species - rules for predators are going to be different from those for foragers, for example. We humans are of course both.
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