Acorns are produced by oak trees. There are about 500 oak tree species worldwide, with 90 of them native to the United States. Oak trees are known for their ability to produce acorns, which are a valuable source of food for many animals, including squirrels, deer, birds, and other wildlife. The production of acorns by oak trees is essential for the ecosystem, as they provide vital nutrients for various species and contribute to the overall health of forests. Oak trees can produce a large number of acorns during their lifetime, with some trees capable of producing up to 10 million acorns. The production of acorns by oak trees is not constant, as it follows an irregular cycle, with mast years occurring every 2 to 3 years. This phenomenon, known as masting, involves the synchronization of an overproduction of acorns by oak trees over a large area, which helps ensure the survival of some acorns despite being consumed by predators.