Chickadees cache as many as one hundred thousand food items per year. Not only do chickadees remember their seed cache sites, but they also remember details like which food items were the most favored and which seeds have already been eaten by them or by a thief. To support such an incredible memory, chickadees grow 30 percent more neurons in the fall when caching behavior peaks. Last April, researchers at Columbia University added to our understanding of chickadee memory. They discovered that chickadees create "neural barcodes" and essentially create their own system for inventory and checkout—just like at a grocery store!