Theropod, Bird, or something else?

[Mochaccino]

Hello,

 

I'm asking about the following bone end. It's said to be from the "Judith River Formation North of Havre, MT". Seller thinks it might be a bird bone since it's hollow but doesn't look like theropod, what do you think? @Troodon confirmed it's not dinosaur and might be turtle, is there enough to tell? And how would one make that distinction?

 

 

 

[MarcoSr]

Reminds me also of an anuran humerus.  Below are Eocene/Oligocene anuran humeri from Nebraska that are only 3 mm to 3.5 mm.  But based upon size, it is probably a turtle humerus.

 

 

 

 

 

 

Marco Sr.

[jpc]

Marco is spot on... frog humerus.  

[Troodon]

When you guys  @MarcoSr @jpc  said frog the light came on.  Here is a JRF publication that supports that diagnosis. 

 

[Mochaccino]

5 hours ago, MarcoSr said:

Reminds me also of an anuran humerus.  Below are Eocene/Oligocene anuran humeri from Nebraska that are only 3 mm to 3.5 mm.  But based upon size, it is probably a turtle humerus.

 

 

 

 

 

 

Marco Sr.

 

34 minutes ago, jpc said:

Marco is spot on... frog humerus.  

 

1 minute ago, Troodon said:

When you guys said frog the light came on.  Here is a JRF publication that supports that diagnosis

 

 

I see, thank you all!