The forked tongue of a rattlesnake flicking in and out is an iconic image of the American West. But why do rattlesnakes stick out their tongues so frequently? The answer has to do with how these reptiles sense chemicals in their environment, especially how they smell potential prey or predators.
If you’re short on time, here’s the quick answer: Rattlesnakes use their forked tongues to collect odor molecules and transfer them to special sensory cells in their mouth called the Jacobson’s organ. This allows them to detect and analyze scents.
In this approximately 3000 word article, we’ll explore the unique anatomy that allows rattlesnakes to smell with their tongues, how this ability helps them hunt and avoid danger, myths about snake tongues, and more.
Rattlesnakes Have a Special Organ for Chemical Sensing
Rattlesnakes, like all snakes, have a remarkable ability to detect and follow chemical trails left behind by potential prey or predators. This ability is thanks to a specialized sensory organ called the Jacobson’s organ, also known as the vomeronasal organ.
The Jacobson’s Organ Detects Scents
The Jacobson’s organ is a patch of sensory cells within the roof of a snake’s mouth. It connects to the nasal cavity via two ducts. When a snake flicks its tongue out, it picks up minute chemical particles from the air or ground.
The tongue then transfers these particles to the Jacobson’s organ upon retraction. Here, the chemicals bind to specialized receptors that send signals to the brain, allowing the snake to detect and interpret scents.
Studies show the Jacobson’s organ allows snakes to detect prey odors with impressive sensitivity. For example, garter snakes can pick up the scent trails of earthworms and follow them to a precise location (Ford and Burghardt, 1993).
Rattlesnakes are also able to follow the scent trails left by rodents several days prior.
In addition to sensing prey, the Jacobson’s organ also allows snakes to pick up the scent of predators and potential mates. It is a crucial tool for snakes’ survival and reproduction in the wild.
Snakes Actively Use Their Tongues to Collect Odors
A snake’s forked tongue is perfectly adapted for gathering scent particles. The two prongs allow the snake to collect from a wide area with each tongue flick. As the tongue retracts, it folds inward, depositing the captured molecules into the Jacobson’s organ.
Snakes continually flick their tongues in and out to gather chemical information from the environment. When following a scent trail, they may flick their tongues up to 12 times per second! This constant tongue flicking allows them to detect very faint odors and follow them to the source.
In addition to flicking, some studies show snakes may use their tongues to literally taste the air. Sensory cells on the tongue can detect some odor molecules dissolved in liquid droplets.
By both flicking and tasting, snakes can gather an amazing amount of chemical information about their surroundings. This detailed odor-mapping allows them to find food, avoid danger, and sense potential mates – critical abilities for survival in the wild.
A Forked Tongue Helps Rattlesnakes Follow Scents
Each Prong Can Follow a Separate Scent Trail
A rattlesnake’s forked tongue allows it to detect smells in a unique way. When the tongue flicks out, it picks up odor molecules from the air or ground. The two prongs of the tongue work independently, so each prong is gathering a separate set of smells.
When the tongue retracts back into the mouth, these odor samples go to two different sensory organs called the vomeronasal or Jacobson’s organs. So a rattlesnake is actually getting two “snapshots” of the available smells from the environment.
This ability comes in handy when a rattlesnake is tracking prey or detecting potential threats. As the tongue flicks out and gathers scent samples, the rattlesnake can compare and contrast the smell trail that each prong is following.
If one prong senses the prey getting stronger while the other prong senses it getting weaker, the snake can determine which direction its next move should be in order to get closer to lunch 🐀!
Rattlesnakes Can Detect the Direction of a Smell
A key advantage of having a forked tongue is that rattlesnakes can use it to identify the direction a particular scent is coming from. As mentioned earlier, when each prong follows its own scent trail, the snake compares the two.
If one prong definitely picked up more of a certain smell, the snake knows that prong was closer to the source.
So when a baby rattlesnake is flicking its little tongue out, it is mapping a 3D odor landscape in its surroundings. By noting which side picks up critical smells like food or enemies stronger, the snake hones in on targets.
This directional sensing allows rattlesnakes to effectively track and hunt prey or avoid predators – which is pretty crucial for survival!
In fact, studies show that blindfolded rattlesnakes can strike accurately at a rodent based solely on the directional tongue-sensing of chemical cues. And hungry rattlesnakes are able to follow precise odor trails left by rodents for up to four days after the animal has passed by 🐍.
Smell Helps Rattlesnakes Hunt and Avoid Danger
How Rattlesnakes Use Smell to Track Down Prey
Rattlesnakes rely heavily on their sense of smell, known as olfaction, to locate and capture prey. Their forked tongues collect odor molecules from the air and ground. These scents are then processed through the Jacobson’s organ, a special sensory structure in the roof of their mouths.
Powerful smells like rodent urine or nesting materials can draw rattlesnakes to their next meal.
In fact, studies show that rattlesnakes can detect the scent of prey animals like rats and mice from over 30 feet away. They use their tongue to sample smells in different directions and piece together a “scent trail” to follow.
Their heat-sensitive pits between the eyes and nostrils also aid in homing in once prey is near. So between smelly chemical cues to initially locate prey, and thermal cues to finally strike, rattlesnakes are expert hunters.
Rattlesnakes Can Smell Predators and Threats
Smell not only helps rattlesnakes find food, but also protects them from threats. These snakes can detect the scent of predators like hawks, coyotes, and humans from a safe distance. Specific compounds in skin secretions or feathers cue rattlesnakes that a predator is approaching.
Interestingly, rattlesnakes can even identify each other’s scent trails. They are able to recognize if another of their kind has recently moved through an area. Being aware of other rattlesnakes nearby likely helps them avoid unnecessary conflict and competition over resources.
Rattlesnakes also detect irritating smells that signal danger is near. For example, they recoil from the strong odor released by skunks to keep potential threats at bay. Smoke from wildfires triggers rattlesnakes to quickly flee the area as well.
Common Myths and Misconceptions About Snake Tongues
Forked Snake Tongues Aren’t Venomous
One of the biggest myths about snakes is that their forked tongues are venomous or dangerous. This is simply not true – a snake’s tongue is completely harmless. The tongue itself contains no venom and serves an important sensory purpose for the snake.
A snake uses its tongue to pick up chemical particles from the air and ground to help it smell and perceive its surroundings. The twin tips of the forked tongue allow it to detect smells more acutely. So no, you definitely don’t need to worry about danger from a curious snake’s tongue if it darts out towards you!
Snakes Don’t Literally “Taste” the Air
Another common misconception is that snakes use their tongues to literally “taste” or sample flavors from the air by licking it. This is an oversimplification – while snakes do use their tongues to detect chemicals, they don’t register subjective tastes like sweet, salty, sour, etc.
Instead, according to specialists at the California Academy of Sciences (source), their tongue picks up chemical molecules that contain information about the surroundings – such as potential prey animals nearby, materials that indicate somewhere safe to shelter, plants, water, and even pheromones from potential mates.
Other Interesting Facts About Rattlesnake Senses
Rattlesnakes Also Use Sight, Touch, and Heat Sensing
While smell is their primary sense, rattlesnakes also rely on their other senses to hunt prey and navigate their environments. Their eyesight is quite sharp, allowing them to detect small movements from up to 50 feet away. Rattlesnakes have vertical slit pupils which provide excellent daytime vision.
At night, they rely on their heat-sensing pits to locate warm-blooded prey in total darkness. These pits detect infrared radiation on each side of the head between the nostril and eye. Amazingly, the heat sensors are so precise that rattlesnakes can accurately strike a target less than 0.2 inches in diameter from a distance of 1 foot!
Rattlesnakes frequently use their forked tongues to sample chemicals from the air, ground, and water to build an olfactory “image” of their surroundings. Their forked tongue helps them determine which direction a smell is coming from.
By flicking their tongues in and out, rattlesnakes can detect prey or predators that are nearby. They can even sense ants and follow ant trails using their tongue!
In addition to sensing heat, rattlesnakes use their scales to detect vibrations in the ground. These vibrations help rattlesnakes locate potential food sources or warn them of nearby threats. Their loosely attached skins and sensitive underbellies allow them to detect the faintest vibrations.
When hunting, they often wait patiently for the precise moment to strike their prey by remaining extremely still and sensing for nearby movements.
Baby Rattlesnakes Are Born With Fully Functioning Senses
Baby rattlesnakes are equipped with fully functioning senses from the moment they are born. Their infrared heat sensors allow them to strike accurately at prey within hours of birth – amazing! Their eyes have protective scales over them which fall off within a day or two.
After shedding their protective eye scales, infant rattlesnakes can see as well as the adults. While young rattlesnakes are born with fully developed senses, their rattles are underdeveloped at birth. The rattle grows with each shedding of their skin to warn larger animals of their toxic potential.
Because they are cold-blooded, baby rattlesnakes often stay near the den and bask in the sun to raise their body temperatures. This allows their senses, muscles, and nerves to function optimally for hunting.
As they grow and gain experience, rattlesnakes venture further from the den while tracking prey using their incredible senses of smell, sight, touch, and heat detection.
Conclusion
A rattlesnake’s long, forked tongue is a highly specialized tool for following scents and gathering chemical information from the environment. This unique ability allows rattlesnakes to effectively hunt prey and avoid potential threats.
The next time you see a rattlesnake flicking its tongue, you’ll understand it’s not a threat display. Rather, that forked tongue is key to how the snake experiences the world through smell and taste.
