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Seed hoarding by granivorous animals requires cache-protection strategies which allow to protect hoarded seeds against pilferage. This study reports the first case of acorn hoarding in tree cavities by Eurasian Jays ( Garrulus glandarius ). Out of 116 removed acorns of both pedunculate oak ( Quercus robur ) and Northern red oak ( Q. rubra ), we localized 14 consumed and 102 stored acorns. Five experimental acorns (4.9% of stored acorns) were found stored in tree cavities. The notion that hoarding seeds in tree cavities may constitute a cache-protection behavior of Eurasian Jays represents a working hypothesis that ought to be tested in future studies.

Acorn storage in tree cavities by Eurasian jay (Garrulus glandarius L.)