Man is absolutely not the crown of creation: every creature stands beside him at the same stage of perfection. … And even in asserting that we assert too much: man is, relatively speaking, the most unsuccessful animal, the sickliest, the one most dangerously strayed from its instincts – with all that, to be sure, the most interesting! (Nietzsche)
As opposed to labeling the human animal interesting – Nietzsche is being generous here – I would be more inclined to label it a bizarre creature, given how far it seems to have strayed from its animal roots, in view of its typical behaviour. While much of this can be related back to its animal ancestry – in some perverted sense of continuity – some of it we can not, and this would seem to lead to expectations of something more significant, something more profound than simply action driven by instinct.
Well, at least that is one option we have. But then we have the challenge of having to reconcile that view with all the misery, miscreants, murder and mayhem that the human race has been able to demonstrate on behalf of its members since the beginning of recorded history