Amphibians are cold-blooded tetrapod animals that spend time on land and in water. They lack scales and require water to lay eggs, which hatch into tadpoles and undergo metamorphosis into adult frogs. There are only 6,200 living species, with many extinct amphibians. They are less successful than reptiles and mammals. The first amphibian was Acanthostega, […]
Most modern amphibians are small, but giant amphibians were once dominant predators on Earth. They began to decline when reptiles evolved, and became almost extinct 251 million years ago. Only the Lissamphibia subclass of amphibians still exist, and there is debate about their evolution. Giant amphibians were part of the Labyrinthodontia group, with the most […]
