This week I have a genuine mystery object for you, discovered while emptying cupboards in the Dead Zoo:
Amy idea what these vertebrae might belong to? If it’s of any use for getting a sense of scale, my thumbnail is 20mm across.
I’m interested to hear your thoughts!
Zygoma 
Clearly birdy (pneumatic foramina and saddle-shaped posterior centrum face). The odd short anterior of the pair is probably the axis, and the one behind, Ce 3. I can’t do better than that right now, but will return to this puzzle later.
Cervical, as Adam says, and largish. Thick too, it looks like. Not your delicate little songbird.
The first pic looks like a laterally recumbent gummy bear …. but these are much smaller than any ursine. Amy who are you?
The first few cervical vertebrae of birds are surprisingly small and I judge this axis to be about 25 – 30 mm across the postzygapophyses, using Paolo’s thumbnail as scale. That would suggest a raft of large species. I’m going to guess this one rhymes with “he knew”.
Oh – Yes I think it’s definitely a pouched animal.
But not for a baby!