The Rabid Sloth

Thank you very much for the answers, and of course I'm interested! Suffice to say, this is a little outside my area of expertise, hence the reason for my question. Out of curiosity, I actually made some compression measurements of these spheres, made up of the exact same material, but with varying diameters. In a plot of compression force as a function of volume, they did indeed fall in a linear line. Note that this (seemingly) linear plot was also at quite high levels of deformation (60 % strain) - I guess anisotropy would be less significant than for soil samples/wood etc. (?). As the sphere material is made up, pretty much like this: (More material concentrated around edges, but otherwise I guess there's no directional structures).

Hello everyone! Hope this isn't a silly question, or misplaced, but this is my first post, so please excuse me! Say you are compressing two spheres. The only difference between them being their volume. Would one (ideally, at least) expect the force required to compress the material to have a linear relationship with the volume? Thanks, in advance!