Frank kneels down and picks up a few of the bones, taking a closer look and trying to identify what sort or sorts of creatures they came from "This is strange, bones don't get gathered in one place like this in my experience. Scavengers should be scattering them, and if some predator or toxin was killing lots of creatures in this area, the rest should instinctively avoid it."
He looks up at the judgy corvids, "Maybe they're responsible? Hauling every carcass they can carry back here from all over the woods? I haven't heard about anything of the sort before, but Crows do some weird stuff, and often teach it to their neighbors."
"Either way, this place is not as peaceful as we thought, lets maybe have lunch somewhere else." He pulls out a camera and starts taking some pictures, wanting to send them to a guy who might make sense of this.
Spoiler: OOC
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Not trying to identify species or anything that specific, just if we're mostly talking birds, rodents, snakes, etc. or a mixture thereof sort of thing.
perception (5d10)[2][2][4][1][10](19)