古代盛装食物用的竹木结构器具，内有数层不等。酒肆饭店以及富贵人家常用。
然而，在阴天，这些鸟儿会迷失方向，难以找到食盒的位置。
On overcast days, however, the birds were disoriented and had trouble locating their food box.
在另外一组实验中，克雷默在鸟笼周围放置了完全相同的食盒，这些食盒中只有一个食盒有食物。
In another set of experiments, Kramer put identical food boxes around the cage, with food in only one of the boxes.
准备一个零食盒。
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