[Crucial]

The shell game might make a good memory exercise for anyone wanting to improve or maintain memory.

[rlmorel]

They also said that birds that cache their food (like Chickadees and Blue Jays) have an unbelievable mental map of where they stashed it away. From one article I read:

"...Black-capped chickadees forage for food and instead of eating it all, they store, or cache some of it for later consumption. Food caching occurs mostly during the fall and winter when food supplies are likely to become scarce. It is estimated that chickadees cache as many as one hundred thousand food items per year, usually individually, across a widespread territory and they do not reuse cache sites. They demonstrate a remarkable memory for the location of cached food items for periods ranging from hours to weeks..."

That is humbling. Sometimes, I can't remember where I put something down, or what I had for lunch...:)