Is this bird bone fossil or not?

[Lone Hunter]

I have a hard time telling if bones are fossils unless they are stone or fresh enough to scrape easily. Any help would be appreciated in learning this. Didn't take pic of end but it's hollow.

[Harry Pristis]

I think this is a mammal ulna.

[Lone Hunter]

Learned something already, mammal bones can be hollow. Thanks so much!

[Petalodus12]

@Harry Pristis is right, this is a mammalian ulna. This can be discerned by the olecranon process (the thing on the right end in the 3rd picture). That is the point of articulation that makes up the elbow

[Rockwood]

It does resemble a loon tibia to some degree however. Here is a photo I saved while identifying a modern find.

[caterpillar]

Ulna for sure

[RuMert]

Badger ulna, I have one too

https://link.springer.com/article/10.1007/s00114-019-1604-2/figures/6

[jpc]

Has anyone mentioned mammal ulna yet?

 

[Lone Hunter]

Badger, cool!

[ClearLake]

Definitely an ulna but I think it is much too slender to be a badger.  In looking at various ulnae in Mammalian Osteology by B. Miles Gilbert, it looks to be feline, probably something like a bobcat based on the slender straight shape, squared off end (right side in pics below) and shape of groove along the side.

[Lone Hunter]

I would have to agree with that, and also cool!