page_title: Amphibian
section_title: As food
hierarchical_section_title: Amphibian / Human use / As food
caption_attribution_description: English: Frogs in supermarket in Shanghai Deutsch: Frösche im Supermarkt in Shanghai
context_page_description: Amphibians are members of the class Amphibia. The living ones are frogs, salamanders and caecilians. They are four-legged vertebrates which are cold blooded.
  Amphibians lay their eggs in water, usually in a foam nest. After hatching they are tadpoles, which live in the water and have gills. The tadpoles change into adults in a process called metamorphosis. When they are adult, they have lungs to breathe instead of gills, and legs. Adult amphibians also use their skin to take in oxygen, and some species of salamanders do not have lungs.
  The earliest amphibians evolved in the Devonian from lobe-finned fish which had jointed leg-like fins with digits. They could crawl along the sea bottom. Some had developed primitive lungs to help them breathe air when the stagnant pools of the Devonian swamps were low in oxygen. They could also use their strong fins to hoist themselves out of the water and onto dry land if necessary.
  For tens of millions of years, during the Carboniferous and early Permian, amphibia were top predators on land, especially in the low-lying tropical river systems.
context_section_description: Bullfrog legs are a source of food for Southern United States and the Midwestern United States. People hunt bullfrogs at night near rivers. The bullfrogs' legs are cooked, while their backs are fried.ᵖ⁹ In China, bullfrogs are sold alive for eating. However, they are later cooked dead with vegetables. In the state of California, people must have a license to catch bullfrogs for food.ᵖ²⁵⁶ In schools, bullfrogs are dissected in biology classes. Usually, this is done in grammar school.ᵖ⁸⁵ The dissecting is a method for teaching students the anatomy of a bullfrog.ᵖ⁸⁵ The emperor newt is hunted in China for food. They are also used there for medicine. Burrowing frogs are able to hold water in their bladder, because of this indigenous Australians use them to drink water.ᵖ¹³
caption: Bullfrogs being sold alive at a supermarket in China.
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