I was working my way through a box of large ratite bone the other day and stumbled across this out-of-place object: 
Any ideas on what it might have come from and why it might have been in a box of Ostrich bits? As usual, you can put your questions, thoughts and suggestions below – if you think it’s easy then maybe try using a clue to give other people a chance of working it out for themselves. Have fun!
Zygoma
Adventures in natural history collections
Zygoma 
Horse femur?
A right Perissodactyl femur
It ‘apirs to be a femur.
I’d say an ed fr, but I couldn’t take it down further to species. Did someone think it was ostrich and the poor ostrich skeleton has one bone less than it ought to? Perhaps you should look in the e***d skeleton boxes and see if you find the lost ostrich bone there?