Kingsnakes are the most well-known snake predators of rattlesnakes, but they’re not alone. Several snake species across the Americas actively hunt and eat rattlesnakes, using different strategies ranging from brute constriction force to powerful jaws to a combination of venom and muscle. Here’s what makes each of them effective.
Kingsnakes: The Top Rattlesnake Predator
Kingsnakes earned their name for a reason. They regularly prey on other snakes, including venomous species like rattlesnakes, copperheads, and cottonmouths. A study of 2,662 California kingsnake specimens found that rattlesnakes made up 24% of their snake meals by frequency and a striking 37% by biomass and energy. In arid regions where the two species overlap most, kingsnakes ate even more snakes relative to other prey like rodents and lizards.
What makes kingsnakes so effective is a two-part advantage: venom resistance and raw constriction power. Kingsnakes are born with a resistance to pit viper venom. Their blood contains antibodies that interfere with the venom’s effects. Mice injected with kingsnake blood survive doses of viper venom that would otherwise kill them, which confirms that the protection is chemical, not just behavioral. The full molecular mechanism still isn’t completely understood, but the resistance is innate, meaning kingsnakes don’t need prior exposure to develop it.
Their constriction strength is also exceptional. Researchers measured squeeze pressure across 182 snakes using dead mice fitted with pressure sensors and found that all three kingsnake species tested produced significantly higher constriction pressures than comparably sized rat snakes. Some kingsnakes squeezed twice as hard as needed to kill a rodent. Pound for pound, they are simply stronger constrictors than other common snake species, which gives them a decisive edge when wrapping around a thrashing rattlesnake.
Eastern Indigo Snakes: No Constriction Needed
The eastern indigo snake is the longest native snake in North America, reaching over 8 feet, and it takes a completely different approach to killing rattlesnakes. Indigo snakes are not constrictors. Instead, they use their powerful jaws to crush and overpower prey directly, sometimes pinning a rattlesnake’s head and swallowing it alive. They’re considered apex predators in their longleaf pine and scrubland habitats across the southeastern United States.
Indigo snakes are opportunistic feeders that eat fish, frogs, birds, rodents, and other snakes. Their size advantage over most rattlesnakes in their range, combined with jaw strength and apparent tolerance to venom, makes them one of the few snakes that can take on a full-grown rattlesnake without needing to squeeze it into submission first.
Coachwhips and Racers: Speed Over Strength
Coachwhip snakes (sometimes called red racers in the western U.S.) and their close relatives, the North American racers, are fast, aggressive hunters that do prey on rattlesnakes, particularly juveniles and smaller species. These snakes can move at speeds that most other snakes can’t match, and they rely on that quickness to strike and grab prey before it can mount a defense.
Coachwhips don’t constrict in the classic sense. They pin prey with their body weight and begin swallowing it, sometimes while it’s still alive. They lack the venom resistance of kingsnakes, so they tend to target smaller or younger rattlesnakes where the risk of a serious envenomation is lower. Observations from the southwestern U.S. confirm coachwhips swallowing rattlesnakes whole in the wild.
Cottonmouths: Venomous Snake vs. Venomous Snake
Cottonmouths (water moccasins) are pit vipers themselves, closely related to rattlesnakes. They occasionally prey on rattlesnakes when the opportunity arises. This is more opportunistic than systematic. Cottonmouths are generalist predators that eat fish, frogs, birds, and other snakes, and a rattlesnake that wanders into a cottonmouth’s territory can become a meal. Both species are highly venomous, so these encounters can go either way, but cottonmouths have been documented killing and consuming rattlesnakes in the wild.
Mussuranas: Latin America’s Snake Specialist
Outside the United States, the mussurana fills a role similar to the kingsnake. Found across Central and South America, this large rear-fanged snake specializes in hunting other snakes, including the neotropical rattlesnake. Mussuranas use a combination of mild venom and constriction to subdue their prey. They track other snakes by scent, attack, bite to deliver their own venom, then wrap and constrict before swallowing.
In some rural areas of Latin America, mussuranas have historically been valued for their role in controlling populations of dangerous snakes near human settlements.
How Rattlesnakes Try to Defend Themselves
Rattlesnakes aren’t helpless in these encounters. They have a specific defensive posture used almost exclusively against snake predators called the “body bridge.” Instead of coiling into a strike position as they would against a mammal, rattlesnakes raise a loop of their body off the ground and use it to push or throw the attacking snake away. This behavior is distinct from their normal defensive repertoire and appears to be an evolved response to the specific threat of ophiophagous (snake-eating) predators. It’s not always enough. Kingsnakes in particular are persistent hunters that will continue attacking even after being thrown off.
Can You Attract Kingsnakes to Control Rattlesnakes?
This is a common question from homeowners in rattlesnake country, and the short answer is: not really, at least not by releasing them. California’s Department of Fish and Wildlife has explicitly said it would not approve releasing kingsnakes for rattlesnake control, for two reasons. First, released snakes can spread pathogens and parasites to wild populations. Second, introducing snakes from a different area can disrupt local genetics.
There’s also a practical problem. California kingsnakes are habitat generalists found across a wide range of environments. If your property doesn’t already have kingsnakes, it likely isn’t suitable habitat for them, and released snakes probably wouldn’t stick around long. The better approach is to make your property hospitable for the wildlife already present: rock piles, brush cover, and undisturbed ground near natural areas will support kingsnake populations that are already established in your region. If kingsnakes are nearby, they’ll find the rattlesnakes on their own.