Friday mystery object #83

This Friday I’ve decided to give you a challenge in the form of one of my favourite interesting animal bits. This mystery object is one that a few people in the know will identify immediately, because it is so distinctive, but anyone who hasn’t seen one before is likely to struggle a bit.

Do you have any idea what type of bone this is and which species it came from? (N.B. it’s the same bone photographed from different sides.)

For those few that are in the know perhaps you could drop hints rather than blurting out the answer and for the rest of you, please feel free to ask for clues – I will do my best to offer guidance throughout the day.

Good luck!