Frog adults are basically tailless, eggs are generally produced in water, hatch into tadpoles, and breathe with their gills. After metamorphosis, adults mainly breathe through the lungs, but most skin also has some breathing function. Anurak is the first step for creatures to land from the water, which is more advanced than other amphibians. Although most of them can survive without water, their reproduction is still inseparable from water, and eggs need to undergo metamorphosis in water to grow. So it is not as advanced as reptiles, and it is completely possible to live without water.
Extended data
Frog body
The smallest frog is only 30mm, only as long as a person's thumb, and the largest frog is 300mm (more than a foot long). Its pupils are all horizontal, its skin is smooth, its tongue is forked, and it turns up and down along the front of its mouth to catch insects. There are three eyelids, one of which is transparent to protect the eyes in water, and the other two upper and lower eyelids are common. There are two sound sacs on both sides of the head, which can produce * * * and amplify sound. Smaller varieties have higher frequency of calls.
Frog habit
Frogs reproduce in a similar way to toads. They also feed on insects, but large frogs can prey on small fish and even mice. They basically hunt at night. Most of them live in water, and some live in trees in the humid environment of the rainforest. Eggs are born in water, and some tree frogs can get through the tadpole stage by accumulating residual puddles in tree holes or plant leaf roots.
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