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No scale, and I'm no expert but see this;
Looks like it!
Strictly speaking if this indeed a wale bone then it should be in the mammal group.
This is the vertebra of a cetacean, scale would help to decide if it is a dolphin or a whale. My feeling is this is a dolphin. I think only dolphins have the radiating wheel spoke pattern on the solid part of the vertebra.
Please move this over to mammals there are other people over there who can help identify this.
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I've had a look on line and the great whale vertebrae are more robust so it is likely to be from a small toothed whale a group that includes dolphins and porpoises - it is not like the picture of a harbour porpoise vertebrae I found so it is most likely to be from a bottle nosed dolphin as they are the most commonly occurring species on our coast -although common, striped, risso's, white sided, and white beaked dolphins, long finned pilot whale and orca all occur occasionally in that area
I agree with your deductions pirayaguara, however, you have to be careful with vertebra because they change shape along the spinal column in all mammals, the neck vertebra are often very different to the lower back vertebra for example. Most books and web sites show one vertebra and imply they all look like this for that species! Hence the reason I hoped for some sort of scale just to be sure.
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