According to the statistics of FAO, a medium-sized black frog eats about 70 insects a day, and if it preys for 7 months a year, it can kill about 1.5 million pests.
Tadpole (tadpole in English), written as "family bean" in ancient times, is the larva of amphibians such as frogs, toads and salamanders, also known as toad eggs. The newly hatched tadpoles are spindle-shaped, with no limbs, mouth and inner gills, long tail, flat side and branched outer gills on both sides of the head, which are adsorbed on aquatic plants and fed by the remaining yolk in the body. Mainly in groups. When tadpoles mature, they begin to lose their shape, gradually grow limbs, and then (for frogs and toads) gradually degenerate their tails through apoptosis (controlling cell death).