Northwest Wisconsin. Dropped from an ospray nest.
this post was submitted on 10 Oct 2023
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I don't think this is a scale, it looks an awful lot like an otolith, which is a calcium carbonate buildup from inside a fishes head. These are often used by biologists to age a fish similar to counting rings on a tree.
I still don't know what species would have one shaped like that but it may help you to look in better places to identify it.
It has a socket at the left side. Like a ball in socket joint.