我在公园看见过红头啄木鸟干这事。我看了它几个月，现在它不见了

这是网络图片：

The acorn woodpecker constantly makes "holes" in a dead tree stump during the summer and fills those holes with acorns that it can eat in winter. These woodpeckers can store "50,000" of these acorns in a large tree.