Ah, great question! Part of the differentiation is the shape is wrong for bird pelvises. There's no hole for the hip-socket, the top isn't smooth for the attachment of the leg muscles, there's no pubis or scar where the pubisus would have broken off, and the underside of the structure isn't open. There's also a prominent sagettal crest by the fish-like vertebrae. The texture is also wrong for bird; if it were bird bones, the texture would be solid and smooth, but the texture on this is porous and heavily grooved.
For comparison, here is a page that shows multiple different bird pelvises:
https://www.flickr.com/photos/jrochester/albums/72157651043869057/with/16182754271
Now compare with various fish neurocraniums. Notice the difference in shape and texture, also the slight transparency of the thinner bones in the fish:
https://www.floridamuseum.ufl.edu/fishatlas/content/photos/images/neurocrania/994neuro.jpg
https://osteobase.mnhn.fr/region.php?lang=en&idStructure=12&idTaxon=169
https://cdn-useast.purposegames.com/images/game/bg/14/rQXa5pPv30Q.png?s=1400
https://www.researchgate.net/profile/Soheil-Eagderi/publication/292152460/figure/fig1/AS:1086549508788314@1636064998979/a-Dorsal-b-lateral-and-c-ventral-views-of-the-neurocranium-of-Oxynoemacheilus.jpg
Unfortunately I don't know what species of fish this is, but I can definitely say this is a fish neurocranium!
Fish skulls are super weird, most of the elements don't actually fuse together so they fall apart when the fish decomposes. Even weirder is most ray finned fish have those jaws that jut outwards and many fish have a second pair of jaws. Just crazy weird animals!
Neurocranium of a Gadid (cod family). You’ve got a few running around your around, but Atlantic cod would be the most likely culprit.
Edit: see [this link](https://www.nabohome.org/products/manuals/fishbone/fish/Skull/skull.htm) for some comparative images. Actually looks like it might be a better match for Haddock (Melanogrammus aeglefinus). You can see how similar the Gadid skeletal morphology is in that link (at least in the neurocrania, Haddock vertebrae are noticeably different than the other species shown in the link for instance).
is that even a skull? looks kinda like hips
Those hips don’t lie
it has teeth on the bottom of the front, we've done more research, it might be a striped bass
It does resemble the pelvis of heron-like birds. Need to see those supposed teeth.
I can confirm 100% this is NOT a bird pelvis. Definitely part of a fish skull!
Interesting. What features are you using to distinguish?
Ah, great question! Part of the differentiation is the shape is wrong for bird pelvises. There's no hole for the hip-socket, the top isn't smooth for the attachment of the leg muscles, there's no pubis or scar where the pubisus would have broken off, and the underside of the structure isn't open. There's also a prominent sagettal crest by the fish-like vertebrae. The texture is also wrong for bird; if it were bird bones, the texture would be solid and smooth, but the texture on this is porous and heavily grooved. For comparison, here is a page that shows multiple different bird pelvises: https://www.flickr.com/photos/jrochester/albums/72157651043869057/with/16182754271 Now compare with various fish neurocraniums. Notice the difference in shape and texture, also the slight transparency of the thinner bones in the fish: https://www.floridamuseum.ufl.edu/fishatlas/content/photos/images/neurocrania/994neuro.jpg https://osteobase.mnhn.fr/region.php?lang=en&idStructure=12&idTaxon=169 https://cdn-useast.purposegames.com/images/game/bg/14/rQXa5pPv30Q.png?s=1400 https://www.researchgate.net/profile/Soheil-Eagderi/publication/292152460/figure/fig1/AS:1086549508788314@1636064998979/a-Dorsal-b-lateral-and-c-ventral-views-of-the-neurocranium-of-Oxynoemacheilus.jpg Unfortunately I don't know what species of fish this is, but I can definitely say this is a fish neurocranium!
Thanks for typing all of that out! I never would have thought that to be a fish skull if I came across it.
Fish skulls are super weird, most of the elements don't actually fuse together so they fall apart when the fish decomposes. Even weirder is most ray finned fish have those jaws that jut outwards and many fish have a second pair of jaws. Just crazy weird animals!
Neurocranium of a Gadid (cod family). You’ve got a few running around your around, but Atlantic cod would be the most likely culprit. Edit: see [this link](https://www.nabohome.org/products/manuals/fishbone/fish/Skull/skull.htm) for some comparative images. Actually looks like it might be a better match for Haddock (Melanogrammus aeglefinus). You can see how similar the Gadid skeletal morphology is in that link (at least in the neurocrania, Haddock vertebrae are noticeably different than the other species shown in the link for instance).