What is the world's largest type of amphibian by size?

The world's largest type of amphibian by size is the Chinese giant salamander (Andrias davidianus). It is found only in China and can grow up to 1.8 meters (5.9 feet) in length, making it the largest amphibian and one of the largest salamanders in the world.

Chinese giant salamanders have a flattened body, a broad head, and small eyes. They are primarily nocturnal and are mostly aquatic, living in fast-flowing streams and rivers. They feed on a variety of prey, including fish, crustaceans, and other amphibians.

Unfortunately, Chinese giant salamanders are critically endangered due to habitat loss, pollution, and overhunting for their meat, which is considered a delicacy in some parts of China. Conservation efforts are underway to protect this species and prevent its extinction.