Frogs are an important species of amphibians. They can move on land, often at the water's edge or rice fields, and at the same time, they can also move in the water, sometimes going underwater. Tadpoles use gills to breathe, can breathe freely in water, and can stay in water for a long time. However, frogs breathe through their lungs, which can store a certain amount of air, so that they can move in the water for a period of time. However, they cannot stay in the water for too long, because after all, they breathe with their lungs, and there is no way to breathe in the water. If they stay in the water for too long, they may drown.

Generally speaking, frogs can't stay in the water for too long, and they will come out after about 20 minutes. Only then can they breathe and breathe smoothly. Even if they can last longer, they will always come out to breathe.

As mentioned above, frogs can't stay in water all the time because they need to breathe with their lungs. Frogs can breathe smoothly with their lungs on the shore. However, because frogs' lungs are not particularly powerful, they need skin assistance when breathing, which requires their skin to be in a moist state. Therefore, frogs sometimes go to the water, move in the water for a period of time before coming up, and generally do not stay in the water for a long time. In contrast, frogs stay on shore for a longer time. In addition, when frogs are in the tadpole stage, they naturally cannot stay on the shore, because they breathe through gills at this time.