According to The Reotile Database, there are 3,425 species of snakes in the world and 241 species in China. According to Zhao Er Mi's "Snakes of China", there are 205 species of snakes in China.

Of the more than 200 species of Chinese snakes, about a quarter are endemic to China. These snakes are widely distributed throughout China, but mainly in the eastern oceanic boundary south of the Yangtze River, showing the distribution trend and characteristics of a gradual increase in the number of species from north to south. Among them, Fujian Province, Yunnan Province and Guangxi Zhuang Autonomous Region have the most species distributed (85 to more than 100 species), followed by Guangdong, Guizhou, Hunan, Sichuan, Hainan, Anhui and Zhejiang Provinces (60 to 76 species); and the Palearctic boundary has fewer species (<30 species), of which the provinces of Qinghai, Xinjiang, Inner Mongolia and Heilongjiang have the fewest (4 to 10 species)

Common species of snakes in Liaoning area are

1, tiger spotted neck trough snake (poisonous)

Commonly known as pheasant neck, bamboo pole green. The body length of nearly 1000mm, weight is generally 200~400 grams. The back of the body emerald green or grass green, the body on both sides of the anterior section of the coarse black and orange-red patches are arranged, the occiput on both sides of a pair of coarse black "eight" shaped spot.

The tiger snake is a widely distributed, highly venomous snake with a venomous fang of the Dachshund's gland viper, which is brightly colored, and can raise its head and neck when disturbed or provoked, with its neck puffed up and flattened; its body is curved in the shape of an S, and its shape and movements resemble those of a cobra.

2.? Green-ringed sea snake (poisonous)

Reptilia, sea snake family. It is a reptile that lives in the ocean. Poisonous. Length 1.5-2 meters. Its carapace is slightly cylindrical, the body is elongated, and the hind end and tail are laterally flattened. Dorsum dark gray, abdomen yellow or olive. The whole body has 55-80 black ring bands. Lives in the ocean, swims well and preys on fish. Eggs are viviparous.

3, snake island viper (poisonous)

Snake suborder Viperidae viper subfamily Asian pit vipers under the genus of a venomous snake species, mainly distributed in China Liaodong Snake Island, Shenyang City and Dalian City and other areas there are a small number of distribution. This species is endemic to China. The Snake Island Pit Viper is one of the famous venomous snakes in China, and it is distributed in Qianshan Mountain.

More lurking in the undergrowth, dead grass, under the slate or rock crevices, often climbed the daytime Luan, small-leaved Park, yellow elm, leafy bottom plant, Hu Zhizi and other trunks waiting to prey.

4, white striped brocade snake (non-venomous)

Also known as the pillow striped brocade snake, hemp snake. It is a non-venomous snake widely found in northern China. It has a strong life force and is resistant to hunger and thirst. It has a relatively docile temperament and moves slowly. It hunts small birds, lizards and small rodents for food. It is very resistant to hunger and has been recorded as being resistant to hunger for 18 months. It is included in the list of state-protected "beneficial" or terrestrial wildlife with important economic and scientific research value.

5, Jade Spotted Snake (non-venomous)

The Jade Spotted Snake belongs to the snake family, also known as the apricot tree rooted son of Mulberry Root Snake Beauty Snake, the full length of up to about 1 meter. The back of the purple-gray, the head has three black spots; the back of the central line of dozens of black rhombic spots, rhombic spots in the center and the edge of the yellow; abdominal western gray-white, right and left staggered with black transverse spots. Lives in hilly mountain woodlands, preys on lizards and rodents, oviparous.

References:

Baidu Encyclopedia - Tiger-spotted Necked Trough Snake

Baidu Encyclopedia - Green-ringed Sea Snake

Baidu Encyclopedia - Serpentine Island Pitvipers

Baidu Encyclopedia - White-striped Broodsnake

Baidu Encyclopedia - Jade Spotted Broodsnake