Can you find what is hidden?

Some of you already know what this is, don't spoil the surprise!  I found this Sunday and brought it to my classroom to show my kids and teach them a lesson on adaptations since it is in the core, how is that tying a unique find to the core :)  I have not seen one of these since I was a kid, so I was pretty excited to see it just sitting on my car.  Enjoy! - and can anyone tell me what the adaptation might be?