1. Longtu is a Chinese alligator. Because it looks like the legendary dragon, it is commonly known as "Dragon Map" or "Pig Polong", and is also known as China salamander and China crocodile. It belongs to the national first-class protected animal, is an ancient reptile in the world, is now very rare and endangered, and is also one of the smallest crocodiles in the world, mainly distributed in the middle and lower reaches of the Yangtze River.

2. The adult Chinese alligator is generally about 1.5m long, rarely more than 2. 1m, and weighs about 36kg. The Chinese alligator's kiss is short and round, and it is an alligator. The Chinese alligator has a clear division of labor in all parts of its body, including its head, neck, trunk, limbs and tail. The head is relatively large, with a pair of nostrils at the front of the kiss, and the nostrils have valves that can be opened and closed. Eyes are all black, with eyelids and membranes, so Chinese alligator's eyes can also be opened and closed. The whole body skin is covered with approximately rectangular and neatly arranged leather nail plates, and the nail plates in the abdomen are soft. The back is dark brown or dark yellow, the abdomen is gray, the tail is long and flat, and there are gray-black or gray-yellow surgical lines. The back of the body is grayish brown and the front of the abdomen is gray. Flat tail. Newborn crocodiles are black with yellow stripes. The limbs are stout, short and powerful, with claws on the toes, five fingers on the forelimbs and no webbed fingers, four toes on the hind limbs and webbed between the toes. It can live in water or on land.