Red squirrels, which are found all over Europe and Asia, are officially classified as "near threatened" in certain parts of the U.K., with population estimates ranging between 120,000 and 160,000 ...

A squirrel day seems to consist primarily of burying and retrieving nuts. But upon closer observation, there's a little more to this.

Sometimes squirrels will even excavate and then rebury their nuts. This strikes Jacobs as a kind of geographic revision: “It’s not like they cache in September and then they have to remember ...

Well, squirrels impressively manage to find these food caches months after burial using spatial memory, involving various landmarks (e.g., this nut is buried between the garbage can and the driveway).