Spiders eat when prey is close, when they need energy for growth or egg production, and when the timing matches their hunting style.
Most spiders do not follow a strict feeding schedule. They usually eat when they catch or find a suitable meal.
What spiders eat depends on the species, size, and habitat.
Most arachnids eat insects, but some also take other spiders, small reptiles, or unusual foods. That wide spider diet explains why feeding can look different from one web to the next.
When Feeding Usually Happens
Spider feeding often follows prey availability, light levels, and temperature.
Some species are active at night, while others catch food in daylight or eat soon after a successful hunt.
Day Vs. Night Activity
Many web builders wait quietly and eat whenever an insect gets trapped, day or night.
Night-active spider species may feed more after sunset, while some wolf spiders and other hunters move more during the dark hours. Adult male mygalomorphs may come out at night when humidity is higher.
How Often Spiders Eat
Prey size, body size, and season affect how often spiders eat.
A spider may eat several times in a week or go much longer after a large meal. Some can wait a few weeks before feeding again.
Why A Spider May Go Days Without Food
A spider can go days without food because it uses energy slowly and can live on stored reserves for a while.
Spiderlings, small adults, and species in dry or cold weather may still need to feed sooner. Dew or moisture can matter as much as food for many spiders, especially mygalomorphs.
What Triggers A Meal
Spiders eat when a catch is easy, when movement signals prey, or when their body is under stress.
Web vibration, nearby insect activity, and life stages such as molting can all push a spider to feed.
Web Catches And Opportunistic Feeding
A web can trigger a meal the moment it catches a fly or moth.
Many spiders eat whatever is stuck and manageable, including spiders that eat other spiders when the chance is right. This opportunistic style is common in web builders and some ambush predators.
Hunting And Ambush Behavior
Wolf spiders, crab spiders, fishing spiders, huntsman spiders, and jumping spiders do not always wait for a web catch.
They may lunge, stalk, or hide and strike. Ambush predators like a black widow may stay still until prey comes close.
Season, Molting, And Reproduction
Warm months often mean more insect activity, so feeding may rise too.
Molting spiders may stop eating before they shed, while egg production can increase hunger in adult females. Seasonal shifts, breeding, and weather all change when a spider is likely to eat.
What They Eat And How They Consume It
Most home and garden spiders eat small animals that are easy to catch.
They feed in a way that turns solid prey into liquid food, which is very different from how you chew a meal.
Common Prey In Homes And Gardens
Flies, moths, mosquitoes, crickets, grasshoppers, and beetles make up much of a spider’s menu.
Larger species may also take lizards or frogs, and a tarantula may handle bigger prey than a small house spider.
How Chelicerae And External Digestion Work
A spider uses chelicerae to grip, pierce, or inject digestive fluids into prey.
The prey tissues break down outside the body, then the spider drinks the liquid meal.
Rare Plant Feeding And Unusual Diets
A few spiders show unusual diets.
Bagheera kiplingi eats plant material, especially Beltian bodies and nectar, while myrmarachne and phidippus include special prey choices tied to their hunting style. Plant feeding is rare, and most spiders still rely on animal prey.
What Timing Looks Like In Captivity
Pet spiders often eat on a simple rhythm based on age, species, and appetite.
Smaller spiders and active hunters may eat more often, while larger tarantula pets may feed less frequently.
Feeding Schedules For Pet Spiders
Jumping spiders and phidippus often do well on regular but not daily feedings.
Spiderlings usually need smaller meals more often than adults, while a tarantula may eat less often after a larger prey item.
A good schedule follows the spider’s size and activity, not the calendar alone.
Prey Size And Safe Food Choices
Mealworms and crickets are common feeder choices, as long as they are smaller than the spider’s body or easy to control.
Prey that is too large can injure the spider, so safe food choices matter more than variety. Live prey should never be left unattended with a spider for too long.
Signs A Pet Spider Is Not Ready To Eat
A spider that is premolt, stressed, or recently fed may ignore food.
Spiderlings may refuse prey if it is too large or not moving enough.
If your spider backs away, hides, or shows a swollen abdomen, it may not be ready for another meal.
