Closeups of rough areas of birdstone look alike.

[RockinIdaho]

these are close up of rough spots on the curves and bends.

 

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[Indian Steve]

Sorry but I'm not seeing any hint of a birdstone.

 

[GaRebel1861]

That sir, is a rock!

 

[justonemore]

?? Is this an Idaho find? Birdstones aren't found in Idaho
Nothing about it says birdstone but keep on looking for those artifacts there have to be plenty.

 

[The Grim Reaper]

Sorry but all I see is natural erosion and fracturing.

 

[Treasure_Hunter]

Sorry, it is a rock also known as geofact.