Spiders usually eat live prey, and most of their meals are insects. If you want a simple answer to what do spiders eat, think flies, mosquitoes, moths, ants, and other small animals they can overpower.
The exact spider diet depends on the spider species and its habitat. Whether a spider hunts with a web or by active stalking also affects its diet.
Some spiders wait for prey to get stuck in silk, while others chase and pounce. A few even eat other spiders, and rare species have very unusual diets.
What Spiders Usually Feed On
Most spider species eat small animals that are easy to catch and digest. Insects make up the biggest part of a spider’s diet, though some spiders target special prey based on size, habitat, and hunting style.
Common Prey Like Flies, Mosquitoes, and Moths
Many spiders eat flies, mosquitoes, and moths because these insects are common and move through webs or open spaces. Web hunters often catch flying insects, while active hunters grab them on the ground or on plants.
According to Science ABC, web-building spiders often feed on flies, moths, and mosquitoes.
When Spiders Eat Ants and Other Arachnids
Some spiders eat ants when the chance is right, especially species adapted to live near ant trails. Ants can be risky prey, so not every spider tries them.
Other spiders also eat beetles, crickets, and different arachnids when food is scarce or when they can overpower them.
Why Some Spiders Eat Other Spiders
Spider-on-spider feeding is more common than many people expect. Some spider species hunt other spiders, while others eat them when they cross paths.
In crowded places or during food shortages, stronger spiders may take advantage of weaker ones.
How Spiders Catch and Consume Food
Spiders use different hunting methods, but all of them need to immobilize prey before eating. They do not chew like mammals, so they rely on venom, silk, and special mouthparts to turn prey into a liquid meal.
Web-Building Tactics vs Active Hunting
Web-building spiders wait for prey to get trapped. Hunting spiders stalk, chase, or ambush their meal.
Active hunters often rely more on sight and speed. Web builders depend on silk traps.
How Venom, Chelicerae, and External Digestion Work
Spiders use chelicerae, the fang-like mouthparts near the front of the cephalothorax, to bite prey and inject venom. The venom helps stop the prey and starts breaking it down.
Then the spider releases digestive fluids outside the body and drinks the liquefied food.
How Often Spiders Eat
How often spiders eat depends on prey supply, size, and temperature. A spider may eat several insects in a short time, then go days or even weeks without food.
That flexible pattern helps spiders survive when prey is hard to find.
How Diet Changes by Spider Type
Different spider groups feed in different ways. Your local spider’s menu may look very different from another species.
Some are sharp-eyed hunters, some live near water, and some often find easy meals indoors.
Jumping Spiders and Wolf Spiders as Visual Hunters
Jumping spiders and wolf spiders are both active hunters, but they use different styles. Jumping spiders rely on strong vision and quick leaps.
Wolf spiders chase prey on the ground. Their diet often includes flies, small beetles, moths, and other moving insects.
Huntsman, Fishing, and Crab Spiders in Different Habitats
A huntsman spider may catch roaches, moths, or other insects in homes and outdoor spaces. Fishing spiders take prey near water.
Crab spiders often wait on flowers or leaves for visiting insects. Each spider type fits its habitat and food source.
What Household Spiders Commonly Find Indoors
Household spiders usually eat the insects that share your living space. Common prey includes flies, gnats, mosquitoes, ants, and small moths.
As noted by Spiderpedia, house spiders help control pests indoors by hunting where insects gather.
Unusual Feeding Behaviors and Rare Exceptions
Most spiders are strict carnivores, yet a few species break the pattern in surprising ways.
Bagheera Kiplingi and Its Plant-Heavy Diet
Bagheera kiplingi is a rare spider known for eating a lot of plant material. It lives on ant-acacia plants and feeds mainly on special plant parts called Beltian bodies, along with some nectar.
According to Science ABC, this species is one of the few spiders with a mostly plant-based diet.
Beltian Bodies, Nectar, And Why Most Spiders Are Not Herbivores
Some acacia trees produce Beltian bodies, which are protein-rich nodules. Bagheera kiplingi eats these Beltian bodies as an unusual food source.
A few spiders can get energy from nectar in rare cases. Most spiders eat animals because their bodies digest animal tissue, not plant cellulose.
