Frogs in the north are commonly known as Daqingguai, formerly known as frog, green chicken, sitting fish and hare, and scientifically known as black-spotted frog. It is a national protected wild animal.

Frogs belong to chordates, amphibians, Anura and Ranidae. Adults are tailless, eggs are laid in water, fertilized in vitro, hatched into tadpoles, and breathed through gills. After the mutation, adults mainly breathe through the lungs and skin.

habitat

Because the naked skin can't effectively prevent the evaporation of water in the body, they can't live without boiling water or humid environment, and they are afraid of drought and cold. Therefore, most of them live in tropical and temperate rainy areas, and there are very few species distributed in cold zones.

When I was a child, I could only live in water. When I grow up, I can live on land. Frogs breathe with their lungs, but they can also draw oxygen from the air through wet skin. Various pigment cells in its skin will also expand or contract with the change of humidity and temperature, thus changing the depth of skin color. Frogs usually inhabit rice fields, ponds, ditches or grass by the river, sometimes they lurk in the water and usually hunt at night.