Clayton's experiment required jays to remember the type, location, and freshness of storedfood based on a unique learning event.
克莱顿的实验要求松鸦根据一个独特的学习事件来记住所储存食物的类型、位置和新鲜程度。
2
A shorter drought in which they exhausted their storedfood supplies might already have gotten them in deep trouble, because growing crops required rain rather than reservoirs.