Why do negative toads put eggs on their backs?

During reproduction, the skin on the back of the female toad softens like a sponge, and the inner wall of the cloaca is turned out to form a tubular spawning belt, which is bent on the back. The male toad squeezes the female oviposition belt on the back of the female toad, extrudes the seal and discharges sperm to fertilize the egg cell. The fertilized egg is covered with a layer of film. After becoming a young toad at the tadpole stage, it leaves the back of the female toad and enters the water to live.

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