Fantasy Book with Metal Winged Harpy creatures
I don't remember the name, I don't remember the author (it MIGHT be Tamora Pierce maybe?) one of the things I do remember is in the book, is fantasy world, there is a race of Harpy like creatures, that can talk, but they are described as having metal wings, and being absolutely filthy, like they're described as regularly smearing feces on their bodies and in the story they would take the fallen metal feathers from these harpy creatures and use them as like super lethal arrowheads (because of all the crap covering them) does this sound familiar to anyone? (it's entirely possible there is more than one story that has these creatures, I have no idea if I'm just like... describing an established mythological creature or something)