Quick Take
- Gray squirrels bury thousands of acorns every autumn, accidentally making them one of America's most powerful reforesters. See how scatter-hoarding works →
- Squirrels have a reputation for being chaotic, but the reality of their memory is far more impressive than most people expect. Explore squirrel memory skills →
- Squirrels can remember the location of most of their thousands of buried caches, yet so many acorns still end up becoming oak trees. Find out what gets forgotten →
The gray squirrel might be a common backyard animal, but did you know that it’s also a master conservationist? The rodent’s “scatter-hoarding” behavior results in millions of forgotten acorns sprouting into new oak forests. In fact, they likely plant more trees than the U.S. Forest Service, which plants an average of 5 million trees annually.
Here’s how gray squirrels and their scatter-hoarding behavior contribute to a healthy environment.
What Is ‘Scatter-Hoarding’?
Scatter-hoarding refers to the behavior of hiding food in multiple locations, or caches, throughout a squirrel’s territory. This strategy keeps their food safe from other animals and ensures they have supplies when food becomes scarce. For example, gray squirrels bury thousands of acorns, nuts, and seeds—especially during autumn—and retrieve them throughout the winter.
According to research by the University of Richmond, though gray squirrels might eat the majority of their buried acorns, they don’t recover all of them. Thus, the unrecovered acorns can contribute to the regeneration and dispersal of oak trees.
Gray squirrels protect themselves from thieves by burying very many acorns, as many as 3,000 scattered all over their home territory in autumn.
Johan Siggesson, Wildlife & Travel Expert and Wildlife Photographer
The Gray Squirrel as a Master Conservationist
Because they bury so many acorns in autumn, gray squirrels are often called “master conservationists.” The acorns they forget or do not retrieve frequently grow into beautiful oak trees.
Gray squirrels are responsible for unintentionally planting countless oak trees.
©A-Z Animals
“Gray squirrels protect themselves from thieves by burying very many acorns, as many as 3,000 scattered all over their home territory in autumn,” says Johan Siggesson, Wildlife & Travel Expert and Wildlife Photographer. “It follows that each very active gray squirrel plants thousands of tree seeds a year, and because of this, an empty field is turned into a beautiful grove of oak trees.”
Gray Squirrel’s Memory and Spatial Mapping Skills
Gray squirrels are sometimes misunderstood as chaotic animals, but they are actually highly intelligent creatures. Squirrels can plan for the future, use spatial memory to recall where they have buried nuts, and engage in problem-solving behavior.
“Thanks to their powerful spatial memory, which depends on using the landmark cues and the scent marking of their saliva as well as mental images of the ‘clusters’ where caches are located, squirrels can remember 95% of more than 3,000 individual caches,” says Siggesson. “In short, squirrels have an amazing ability to memorize where they have hidden each nut.”
Even so, many acorns are still left behind, resulting in countless new oak trees that benefit the environment.
