Alrighty then, I have a few hollow things to share:

Kokee in the hollow between the sofa and the wall, hiding from thunderstorms.



My hollow strawberry pot.



Hollow dead Cholla cactus, Cholla skeletons I guess they are:



A solar powered frog light:



A hollow owl:



Some ground squirrels hollows:



This bunny has hollow ears. It was chewing on something stick like.