How do tadpoles reach water after hatching from eggs laid on leaves above ponds or streams?

When frogs and toads lay their eggs on leaves or vegetation overhanging ponds or streams, the tadpoles reach the water simply by dropping into it upon hatching.12

For many species, such as those in the family Centrolenidae (glass frogs) and various tree frogs, the process is straightforward: once the eggs hatch, the tadpoles wriggle to the edge of the leaf and fall directly into the water below. In some instances, if a tadpole lands on a stone instead of directly in the water, it will flip about vigorously until it successfully enters the stream.12