Do Snakes Have Blood? Fascinating Facts

Snakes, with their mesmerizing scales and enigmatic charm, have captivated human fascination for millennia. But beyond their striking appearance lies a realm of intriguing physiological wonders. 

One such curiosity is their blood, which has long been a subject of misconception. So, do snakes have blood? And what makes their blood different from that of humans and other animals?

Snakes do have blood and it’s typically red. However, their blood differs from humans and other animals due to the presence of unique proteins, high tolerance for acidity, and ability to clot rapidly.

Keep reading to learn more about snake blood and how a snake’s cardiovascular system works.

Do Snakes Have Blood?

a photo of a snake to show do snakes have blood

Snakes, like all vertebrates, have blood. Their cardiovascular system is adapted to suit their unique needs as ectothermic (cold-blooded) animals. 

Here’s a detailed explanation of the properties of snake blood and how their cardiovascular system works.

  • Closed Circulatory System: Snakes possess a closed circulatory system, meaning their blood is confined within a network of vessels and doesn’t directly come into contact with tissues. This system ensures efficient transportation of oxygen and nutrients throughout the body.
  • Heart: The snake’s heart is a muscular organ responsible for pumping blood. It consists of three chambers – two atria and one ventricle. The ventricle is partially divided, allowing some separation of oxygenated and deoxygenated blood. This setup allows the heart to maintain some level of separation between oxygenated and deoxygenated blood.
  • Oxygen Transport: Unlike mammals, snakes have lower oxygen demands due to their ectothermic nature. Their blood carries less oxygen-binding hemoglobin, resulting in a reduced oxygen-carrying capacity compared to warm-blooded animals. This adaptation allows them to conserve energy and survive at a lower metabolic rate.
  • Unique Blood Proteins: Snake blood contains specialized proteins that aid in digestion, defense, and other crucial functions. One notable example is the presence of venom proteins in venomous species, which are used to immobilize prey or for defense against predators.
  • High Acidity Tolerance: Some snake species consume highly acidic prey (e.g., insects or certain plants). Their blood has a higher tolerance for acidity, protecting their organs from harm and facilitating digestion.
  • Rapid Clotting: Snake blood exhibits remarkable clotting abilities, enabling them to minimize blood loss after injuries or during predation. This adaptation is particularly crucial as they often swallow prey whole, and efficient clotting helps prevent fatal bleeding.
  • Circulatory Adaptations: Snakes can modify their circulatory patterns based on environmental conditions. When inactive, their blood flow is reduced, conserving energy. During digestion, blood flow to the gut increases significantly to aid in nutrient absorption.

How Much Blood Do Snakes Have?

The amount of blood in snakes varies depending on the species, size, and age. On average, snakes typically have about 5% to 8% of their body weight in blood. For example, a 6-foot (1.8 meters) long snake might have around 90 to 130 milliliters of blood. However, these figures can vary significantly among different snake species and individuals.

What Color Is Snake Blood?

Snake blood is typically red, similar to the blood of many other vertebrates, including humans, due to the presence of iron-containing hemoglobin in their blood, which is responsible for oxygen transport.

The color of snake blood remains relatively constant under normal circumstances. However, it is essential to note that some snakes undergo color changes during certain physiological processes. 

For instance, after a meal, their blood may take on a slightly darker hue due to the increased concentration of hemoglobin, aiding in the transport of nutrients from the digestion of prey. Additionally, during shedding, the blood flow to the skin may alter, leading to changes in the skin’s coloration and patterns. 

Despite these temporary variations, the general color of snake blood remains predominantly red.

What Does It Mean for Snakes to Be Cold-Blooded?

When we refer to snakes (and other reptiles) as “cold-blooded,” it means that their body temperature is primarily influenced by the external environment rather than internally regulated like warm-blooded (endothermic) animals such as mammals and birds.

In other words, cold-blooded animals, including snakes, cannot generate their body heat to maintain a constant temperature. Instead, their body temperature fluctuates with the temperature of the surrounding environment. If the environment is warm, their body temperature rises, and if it’s cold, their body temperature decreases.

Being cold-blooded is an energy-saving adaptation, as snakes don’t have to expend as much energy on metabolic processes to maintain a constant body temperature. However, this also means they are more sluggish in cooler temperatures and become more active in warm conditions, making them ectothermic animals.

Is Snake Blood Poisonous?

Snake blood is not poisonous. The venom of venomous snakes is contained within specialized glands and delivered through fangs, typically located in the upper jaw. 

When a venomous snake bites its prey or defends itself, it injec

ts the venom through these fangs, which can cause various effects, including immobilization, tissue damage, and even death in some cases.

However, the blood circulating through the snake’s body itself does not contain venom. The venom is produced and stored in venom glands, and it is only injected into the victim through a bite. 

So, handling snake blood is not dangerous as long as there are no open wounds or cuts on the person handling it. Nonetheless, it is essential to exercise caution when dealing with snakes to avoid potential bites, especially if one is unsure of the snake’s venomous status or handling venomous species without proper expertise and equipment.

Another very common question people have is whether snakes are attracted to blood, and this is a very tricky question, which is why I’ve made this guide that explains whether snakes are actually attracted to blood here, so make sure to check it out.

Does Snake Blood Have Real Medicinal Benefits for Humans?

There is no scientific evidence to support the notion that snake blood itself has any direct medicinal benefits for humans. While traditional medicine in some cultures has used snake blood and other snake-derived products for various purposes, including medicinal uses, these claims lack substantial scientific validation.

It is crucial to understand that the medicinal use of snake blood or any other animal-derived substances requires rigorous scientific research and clinical trials to establish safety, efficacy, and potential therapeutic applications. Without such evidence, the use of snake blood or its derivatives for medical purposes is not recommended.

Moreover, handling snake blood or attempting to use it for medicinal purposes can pose health risks due to potential exposure to pathogens or toxins present in the blood. It is essential to rely on scientifically proven and regulated medical treatments for any health-related concerns.


In conclusion, our exploration into the world of snakes and their blood has revealed a captivating tapestry of adaptations and marvels. 

Snakes, indeed, possess blood, with its mesmerizing red hue, just like many other vertebrates. Their circulatory system is a marvel of efficiency, catering to their unique needs as cold-blooded creatures. 

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