For the classification of snakes, according to the category can be divided into swimming snakes, cobras, pythons, vipers and so on, if according to the toxicity of the classification of only two kinds: venomous snakes and non-venomous snakes, and in the snakes, there is a kind of widely disputed snakes, theoretically non-venomous snakes, but in practice there is a snake venom, it is difficult to define this kind of snake? The tiger-spotted neck and trough snake.

The tiger spotted garter snake is also known as the pheasant neck snake because it has a distinctive neck groove on the back of the neck and a pair of thick black patches on either side of the occiput. Pheasant neck snakes belong to the family of vipers, which are known to crawl faster, but most vipers are non-venomous, whereas tiger neck snakes can use their poison to paralyze their prey, attack their enemies, and so on.

Are pheasant neck snakes venomous, or non-venomous? Theoretically, it is a non-venomous snake because unlike other venomous snakes, the venom glands of the pheasant neck snake are not connected to the fangs by a conduit, and its venom does not pass through the conduit of the fangs but enters the wound of the bitten person by other physical means.

Pheasant neck snakes are widely distributed throughout the country, in many places are considered a non-venomous snake, because the pheasant neck snake is close to the back of the fangs of the snake, but the back of the fangs of the pheasant neck snake is very short, in the back of the snake's mouth, coupled with the personality of the snake is relatively docile, the bite will not be very deep, unless the bite is accompanied by a swallowing action, in which case the back of the fangs of the fangs of the fangs of the snake generally can not bite the person, so some people are not poisoned. In this case, the back of the fangs generally can not bite people, so some people were bitten, but also will not be poisoned.

The tiger grouper is also considered to be a slightly venomous snake in many places, and its venom is not mainly used to hurt people, but to help with swallowing and digestion. The venom of the tiger grouper belongs to the blood-circulating venom, and will destroy the human coagulation mechanism to cause hemorrhage, but if it is not an allergy, it will not be threatened, and there is only one case of a tiger grouper biting a human being in the record, which was an allergy to the tiger grouper's venom and died, not being poisoned, as a result of an allergic reaction to the tiger's venom.

Is the pheasant neck snake venomous, or non-venomous? This controversy still persists, with some places considering it a venomous snake and others considering it non-venomous. The tiger spotted neck groove snake, which has a peculiar venom gland structure, is known as the pheasant neck snake for another reason: it is considered to be the prototype of the legendary cocklesnake, which has its legend in a vast area, but there has been no biological specimen, making it difficult to confirm whether this snake really exists?