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I maybe mad I maybe not: something that jumps genre abruptly might be interesting/fun in it's own weird way. The main time. My guess is that Snow Drift murdered somebody for her wings in a creepy and evil way. 

> in a world that probably doesn't have an equivalent, although I imagine the indigenous Buffalo of the David clan have hunting equipment called the David Bow.
Let's not forget the Diamond Dogs! 

> The two unicorn colleagues have been thrown off kilter by the sighting of Snow Drift,
I know you're not aiming for realism but we have plenty of real world examples of authorities being thrown off worse than that (or just being stupid without anything bad going on). I can believe it.