Acorn nut

An acorn nut is the fruit of oak trees, belonging to the family Fagaceae. It is a hard, woody nut that typically contains a single seed, although some species may produce acorns with two seeds. Acorns are generally oval or rounded in shape and are encased in a tough shell, which is often topped with a cup-like structure called a cupule. Acorns serve as an important food source for various wildlife, including squirrels, deer, and birds.