Seeing a snake bite a frog may mean that the snake is preying on the frog, which is a very common phenomenon in nature. Snakes are carnivores, mainly feeding on frogs, lizards, birds and mice. In nature, it is very common for snakes to eat frogs, because they are species in the same ecosystem and there is a predatory relationship between them.

However, it is not common for snakes to eat frogs in human society, because snakes are often regarded as harmful animals in human society, and human beings will take various measures to eliminate them. Therefore, in human society, the phenomenon that snakes eat frogs is not common, and it has no predictive function.

Generally speaking, it is normal to see snakes biting frogs in nature, so don't pay too much attention.