Venomous Snake
Overview
A venomous snake (독사, venomous snake) refers to a snake capable of injecting venom produced in venom glands through fangs. Globally, approximately 600 species are classified as venomous, accounting for about 20% of all snake species. Venomous snakes play a crucial role in ecosystems as both predators and prey, and for humans, they are objects of fear as well as important subjects for medical research. The annual number of deaths caused by venomous snakes is estimated to range from 81,000 to 138,000, with the impact concentrated particularly in tropical and subtropical regions.
Main Content
Classification and Evolution of Venomous Snakes
Venomous snakes are broadly divided into two lineages: the Viperidae (Viperidae) and the Elapidae (Elapidae) are representative. Viperidae includes the subfamily Crotalinae, which possesses heat-sensing pit organs, and includes rattlesnakes, Asian pit vipers, and bushmasters. Elapidae includes cobras, mambas, and coral snakes, which have fixed front fangs. The evolution of venomous snakes dates back to the late Cretaceous period about 60 million years ago, and through gene duplication and mutation of venom protein genes, they have developed a variety of toxins.
Composition and Mechanism of Action of Venom
Venomous snake venom is a complex mixture of proteins, with major components including neurotoxins, hemotoxins, and cytotoxins. Neurotoxins block acetylcholine receptors at the neuromuscular junction, causing respiratory paralysis, and are commonly found in Elapidae. Hemotoxins damage vascular endothelial cells, leading to hemorrhage and tissue necrosis, and are primarily observed in Viperidae. Cytotoxins directly destroy cell membranes, causing local pain and swelling. The composition of venom varies depending on species, individual, habitat, and prey, which is a major challenge in antivenom development.
Interaction Between Venomous Snakes and Humans
Venomous snakes contribute to rodent population control in agricultural ecosystems, but contact with humans leads to snakebite incidents. The World Health Organization (WHO) has classified snakebite as a 'neglected tropical disease' and set a goal to halve deaths and disabilities by 2030. Major risk areas include sub-Saharan Africa, South Asia, Southeast Asia, and Latin America. The core of treatment is the administration of antivenom, which is extracted from the serum of horses or sheep immunized against specific toxins. However, issues of cost, distribution, and storage of antivenom remain challenges.
Ecological Role and Conservation
Venomous snakes maintain ecosystem balance as mid-to-top predators in the food chain. However, due to habitat destruction, climate change, and human persecution, many species are endangered. Over 100 species of venomous snakes are listed on the International Union for Conservation of Nature (IUCN) Red List. Conservation efforts include habitat protection, cracking down on illegal trade, and community education. For example, in India, a 'Snake Rescue Network' is active, and in Costa Rica, protected areas for venomous snake habitats have been designated.
Latest Trends
As of 2024-2025, there are several significant changes in the field of venomous snake research and management. First, the development of 'recombinant antivenom' using synthetic biology is accelerating. In 2024, a UK research team succeeded in producing monoclonal antibodies against cobra venom using genetically engineered yeast, which has lower production costs and fewer side effects than traditional antivenom. Second, research integrating climate change data into venomous snake distribution prediction models has increased. According to a study published in early 2025, global warming is predicted to expand the habitat of rattlesnakes northward across the North American continent. Third, research on the medical applications of venomous snake venom is active. In 2024, Brazilian researchers discovered a blood pressure-lowering peptide from the venom of the jararaca snake (Bothrops jararaca) and applied it to the development of hypertension treatments. Fourth, the WHO's 'Global Snakebite Initiative' is operating pilot programs in 50 countries by 2025, and a real-time snake identification and antivenom inventory management system via mobile app has been introduced. Fifth, in terms of venomous snake conservation, in 2024, protected areas for venomous snake species cohabiting with the Komodo dragon (Varanus komodoensis) in Indonesia were expanded, and crackdowns on illegal pet trade were strengthened.
Related Topics
- [[Snake]]
- [[Antivenom]]
- [[Toxicology]]
- [[Ecosystem]]
- [[WHO Snakebite Response]]
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