Balanus

Individual mice of both species participating in our study, even under colder nocturnal conditions, collected water oak acorns (their diet of preference) and mostly consumed this dietary resource while in the their nest box; the nest-box cavity had numerous acorn shells each morning.

Odorous house ants live in hollow acorn shells in the forest.

Holes in the snow surrounded by dirt and bits of acorn shells give away the spot where a gray squirrel has dug up a cache of food.