青蛙,是人们进行生物学实验最常用的实验动物,用量也较多。一般用钩钓青蛙或用手在白天捉青蛙。但这两种方法均不理想,不仅费工费时,并且钓来的青蛙,易受损伤,不利于实验操作。一种较为理想的捉青蛙的方法是,在夜间先用装有两节或三节一号电池的手电筒照青蛙,然后进行捕捉。青蛙的眼虽然大而突出,对运动的物体特别敏感,但在强光直射下 Frogs are the most commonly used experimental animals for biological experiments, and they also have more use. Usually catch frogs by hooking frogs or by hand during the day. However, these two methods are not ideal, which not only takes time and labor, but also catches frogs that are vulnerable to damage and are not conducive to experimental operations. One of the more ideal ways to catch frogs is to use a flashlight equipped with two or three battery cells in the night to capture the frog. Although the frog’s eye is large and prominent, it is particularly sensitive to moving objects, but under strong light