The species of tree that produces the acorn is the oak tree. Acorns are the nuts of the oak and serve as a crucial food source for various wildlife species, including squirrels, deer, and birds. There are approximately 600 species of oak trees worldwide, with varying acorn types. Acorns typically take about six to eighteen months to mature after being pollinated. The oak tree is notable for its strength and longevity, often living for many decades and sometimes even centuries. Oaks play a significant role in their ecosystems, providing habitat and food for numerous organisms.