This Grapsus Grapsus Crab (Sally Lightfoot) have 22736 faces.

This is a low poly modeled for blender 2.80.

This Crab are rigged and you can check 2 poses on the list

There is with this model a 4K skin map and 4K normal map.

If you need some more details there is a multiresolution modifier. But for animation please delete multiresolution modifier.

You can see an example of an illustration of this model in a scene : https://blenderartists.org/t/grapsus-grapsus-sally-lightfoot-crab/1187773