Having implanted a glass window into the skulls of their mice, the researchers mounted a tiny light-emitting diode onto the animals' heads.

在向小鼠头骨植入一块玻璃窗后，研究人员又在它们头上安装了小型的发光二极管。

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In late winter, while his mate stays on the nest with their clutch of two or three eggs, the male heads off to find food for both of them, carrying rats, mice, and squirrels back to the nest.

在冬末，而它的伴侣停留在巢内孵化两个或三个蛋，雄猫头鹰去寻找食物为它们两口，运输大鼠，老鼠，松鼠回巢。

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