Snakes are eaten by a surprisingly wide range of predators, from massive birds of prey to tiny spiders. Mammals, birds, reptiles, and even other snakes regularly hunt them. Some of these predators have evolved remarkable biological defenses against venom, making them specialist snake killers.
Birds That Hunt Snakes
Raptors are among the most effective snake predators on the planet. Snake eagles, various hawk species, and the iconic secretary bird all include snakes as a core part of their diet. The secretary bird, a long-legged raptor that stalks African grasslands on foot, is perhaps the most specialized. It kills snakes, including cobras and black mambas, by stomping them with rapid-fire kicks to the head. Each kick delivers about 195 Newtons of force, roughly five times the bird’s own body weight, and the foot makes contact for just 15 milliseconds. That’s ten times faster than a human blink. The snake is dead or incapacitated before it can strike back.
Roadrunners in North America are another well-known snake hunter, grabbing small rattlesnakes and whipping them against rocks. Herons, egrets, and even chickens will eat small snakes opportunistically. For most of these birds, the strategy is the same: use speed, reach, and precision to avoid the dangerous end of the snake while delivering a killing blow to the head.
Mongooses and Their Venom Resistance
The mongoose is probably the most famous snake predator in the world, known for attacking highly venomous species like king cobras. What makes mongooses exceptional isn’t just their speed and agility. They carry a genuine biological defense against neurotoxic venom. Researchers studying mongoose cells found that five key amino acid changes in the receptor that snake neurotoxins target make the venom unable to bind properly. In simple terms, the chemical “lock” that cobra venom is designed to fit into has been changed just enough that the venom’s “key” no longer works. This doesn’t make mongooses completely immune, but it gives them a significant buffer that lets them survive bites that would kill most animals their size.
Honey Badgers: Snake Specialists
Honey badgers have a well-earned reputation for fearlessness, and their diet backs it up. A study of honey badgers in the Kalahari found that large snakes made up the single biggest source of food by weight, contributing around 46 to 53 percent of their total diet depending on sex. In the hot-wet season, when snakes are most active, that number climbed to nearly 60 percent of dietary biomass. The top three snake species they consumed were mole snakes, puff adders, and Cape cobras.
Honey badgers have thick, loose skin that makes it difficult for fangs to penetrate deeply, and they possess some degree of resistance to certain venoms, though the exact mechanism is less well understood than in mongooses. When bitten by a venomous snake, a honey badger may appear to collapse and lose consciousness but then recover and resume eating its meal.
Snakes That Eat Other Snakes
Some of the most effective snake predators are other snakes. The king cobra, the world’s longest venomous snake, feeds almost exclusively on other snakes. Its diet consists primarily of larger nonvenomous species like Asian rat snakes and pythons up to about 10 feet long. Some individual king cobras become so specialized that they develop a preference for a single snake species and will refuse all others.
Kingsnakes in North America are another classic example. They regularly eat rattlesnakes, copperheads, and other pit vipers. Kingsnakes carry antibodies in their blood that interfere with viper venom. Researchers confirmed this by injecting mice with kingsnake blood, which helped the mice survive doses of viper venom that would otherwise be lethal. The kingsnake’s blood chemistry also changes after exposure to viper venom, suggesting an immune-like response. In Central and South America, mussuranas fill a similar role, specializing in hunting other snakes including venomous lancehead vipers.
Wild Boars, Feral Cats, and Other Opportunists
Many animals eat snakes when the opportunity arises, even if snakes aren’t a staple of their diet. Feral pigs are enthusiastic snake predators. Their thick skin and layer of subcutaneous fat provide some protection against bites, and they will root out and consume snakes they encounter while foraging. Feral pigs and feral cats have both been documented as significant predators of the brown tree snake, an invasive species that devastated bird populations on Guam. Skunks, raccoons, foxes, and coyotes will also eat snakes when they find them.
Domestic cats and dogs sometimes kill snakes as well, though this can be dangerous for the pet. Snakebite is a common veterinary emergency worldwide. Dogs are especially vulnerable to venomous bites because their blood clots faster naturally, which makes venom-induced clotting problems set in sooner and more severely. In Australia, where the eastern brown snake accounts for an estimated 76 percent of pet snakebite cases, only 31 percent of dogs survive bites without antivenom treatment. Cats fare better, with about 66 percent surviving without treatment, likely because their blood chemistry makes them less susceptible to the venom’s clotting effects.
Reptiles and Amphibians
Several lizard species eat snakes. The common collared lizard in North America will catch and consume small snake species. Large monitor lizards, including Komodo dragons, readily eat snakes. Alligators and crocodiles consume snakes that enter their waterways, and large bullfrogs will eat juvenile snakes small enough to swallow.
Spiders and Other Invertebrates
This is where things get unexpected. A 2021 scientific review documented 319 cases of spiders preying on snakes across every continent except Antarctica. The snakes averaged about 26 centimeters (10 inches) long, though the largest recorded was approximately a meter (over 3 feet). Half of all documented cases involved theridiid spiders, a family that includes black widows and redbacks. These small spiders use incredibly strong webs to entangle snakes many times their size. One case from 1933 recorded a theridiid spider feeding on a garter snake 355 times its own body weight.
Tarantulas accounted for about 10 percent of spider-on-snake cases. The Brazilian tarantula Grammostola actaeon, when tested in experiments dating back to the 1920s, actually preferred catching snakes over insects. Giant centipedes, particularly species in tropical regions, also kill and eat small snakes, using powerful venomous pincers to subdue them.