This video from Georgia in the USA says about itself:
Female Red-bellied Woodpecker Delves Into Acorn on Savannah Branch – Nov. 10, 2016
On the Savannah Cam, this Red-bellied Woodpecker works diligently to wedge her acorn in the perfect position before excavating its contents. In addition to nuts and fruit, Red-bellied Woodpeckers are also known to eat a variety of insects, small reptiles, nestling birds and eggs!