Large salamander, scientific name: Siren lacertina, genus Blunt-mouthed salamander, alias: lizard salamander, swamp salamander. No hind limbs, short forelimbs, mucous glands on the body surface, body length up to 90cm, smooth skin without scales, yellowish brown to dark green, with dark stripes or spots. Freshwater wetlands in southeastern North America, including Florida, Georgia, Alabama and the Mississippi River Basin. It inhabits swamps, peat bogs, streams and rice fields, usually 0.5-1.5 meters deep, and depends on humus substrates. Stamp food aquatic insect larvae (mosquitoes, mayflies), crustaceans.

The male length of Xiashan pepper fish is 8.4-11.9 centimeters. The length of the head and torso is 4.7-6.7 centimeters. The tail is very short, accounting for approximately 69.5% of the length of the head and body. There are 13 wrinkles (ribs) on the side of the body. The species nickname Nebula means "cloud like" in Latin. Yellow stripes appear on the back of the tail and the outer edge of the abdomen.

The giant salamander (Andrias davidianus), also known as the fire lizard, has a total length of 12-15 centimeters, obvious grooves between its ribs, no lung structure, and relies entirely on its skin for gas exchange. It inhabits karst geological caves and lives in water, with high requirements for water quality. Feed on benthic cephalopods, annelids, and aquatic invertebrates. There are about 400 species of the largest amphibians in the world. They mostly inhabit freshwater and swamp areas, mainly in temperate regions of the Northern Hemisphere. It is a first-class protected animal in China. Salamanders mainly feed on insects, worms, snails, and some small animals.

The Mexican salamander is a species of amphibian in the family Salamandridae. Bare skin without scales; Both limbs and feet are short; Without vocal cords, unable to produce vocalizations; There are six external gill whiskers on both sides of the head, so it is also called a hexagonal dinosaur. The Mexican blunt mouthed salamander is distributed in central Mexico and is an endemic species of Mexico, famous for its unique appearance and juvenile continuation. The Mexican salamander is classified as critically endangered (CR) on the IUCN Red List of Threatened Species. In China, it is legal to buy and sell artificially bred Mexican salamanders as pets, but it is not allowed to buy and sell wild Mexican salamanders.