Desmarest's spiny pocket mouse has fur-lined pouches beside its mouth. In Costa Rica's wet forests it forages on the ground at night; the Costa Rican diet records focus on palm nuts and other seeds.
It has fur-lined pouches on both sides of its mouth for carrying food. Stiff dark brown fur mixed with cream-colored hairs covers the back and forearms, while the underside and feet are white.
In Costa Rica's wet forests it is often seen foraging on the ground at night. The local diet records are mainly palm nuts and other seeds, which it stores in burrows or surface caches.
An extinction-risk assessment has not been added yet.