The original model has a description of the designer's goals - well achieved!
But there is no need to do anything fancy to make this model print - slice it and print it. No supports, no brim (on my Prusa i3S Mk3 with PLA).
If you happen to be unfamiliar with solving 3D printing problems but want a fun, flexi lizard that will just print - this could be the model for you.
The author remixed this model.
The original .stl file will not print simply - the first layer has just the tips of some of the lizard's toes so there is nothing to stick to the print bed.
To make this version I cut off the toe tips, leaving all flat surfaces across the first layer. This now prints nicely as expected. All the other great features of the original model are still there, unchanged.