Why does this amphibian wait for the rain? The answer is its unique egg-laying behavior. Females of this frog species lay eggs on mud, relying on afternoon thunderstorms in summer to carry them to the water. If this happens too early, they can die due to hypoxia. If this happens too late, they can die due to dehydration. Once the external gills of the tadpoles have developed, enabling them to breathe in water, they anticipate the arrival of rain and the next stage of their lives.