My internet is still down at home, but here’s a Friday Mystery Object anyway!
This time I just want you to work out what group of animals this ribcage comes from:

Here’s a close-up that you might find useful:

Now you don’t need to be an expert to work this out – just work out how this ribcage is similar to the ribcage of other animals and certain features should start standing out to make the answer obvious – a real case of deductive power!
To assist, I will point you in the direction of some useful comparative material and I urge you to consider how function and inheritence both shape bones used in movement.
Feel free to ask questions in the comments section below – I will reply whenever possible. I hope you enjoy the detective work!