The period from mid-March to mid-April is a crucial time of year for many amphibian species, particularly salamanders and frogs, where they use temporary ponds (temporary ponds) for breeding. These ponds do not contain fish that could eat their eggs and their tadpoles must develop before the pool dries up in summer, leading to a frantic 'explosive breeding' event when the conditions are right for mating. This behavior is most noticeable around vernal pools (also known as spring or ephemeral ponds), where amphibians gather to create the next generation. The amphibians that use these ponds live in uplands surrounding them, which often reduce the presence of predators. If the April weather is not suitable for breeding, it can disrupt this cycle and determine the success or failure of the breeding season.