How does sorting different kinds of nuts help fox squirrels remember food caches?

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Do squirrels forget where they hide their food? — squirrel Overview of food-burying behaviour in squirrels.

Fox squirrels, which are a type of rodent, utilize a sophisticated organizational strategy to manage their food caches. Rather than burying nuts randomly, they employ a method known as "spatially chunking".1

By sorting different types of nuts and burying them in separate, species-specific caches, fox squirrels create a structured system that makes it easier to recall the location of each stash. Research has observed these squirrels carefully sorting various nut types and burying them one at a time, ensuring that nuts of the same species are grouped together while different types are placed a short distance away. This organized approach helps the squirrels maintain a reliable memory of their food stores throughout the season.1