What Do Praying Mantises Eat? Complete Feeding Guide by Age and Species

Wild mantises are opportunistic predators. Extension and natural history sources describe them as generalist hunters that eat many kinds of insects and other arthropods, including flies, moths, crickets, grasshoppers, and spiders. Larger species may occasionally capture small vertebrates, but that is not the norm for routine captive feeding.

Because mantises are ambush predators, movement matters as much as prey type. A feeder insect that walks or flies naturally is more likely to trigger a strike than a dead insect left in the enclosure. That is why live feeders are usually the most practical option in captivity.

Freshly hatched mantises need very small prey. Good starter feeders include wingless or regular fruit flies, fungus gnats, and other tiny flies. Hatchlings should usually be offered food daily or every other day because they have limited reserves and grow through frequent molts.

As nymphs grow, prey size should grow with them. Mid-stage nymphs often do well on houseflies, blue bottle flies, small roaches, and similarly sized soft-bodied insects. Adults can usually eat larger flies, moths, roaches, locusts, and appropriately sized crickets. A common husbandry guideline is to choose prey no longer than the mantis's abdomen or about one-third to one-half of its body length, then adjust based on how confidently the mantis handles it.

Flies are often considered one of the best staple feeders for many mantis species because they stimulate a natural hunting response and are less likely than some feeders to bite back. Fruit flies work well for tiny nymphs, while houseflies and bottle flies are useful for larger juveniles and adults.

Other commonly used feeders include small roaches, moths, and occasional crickets or locusts. Roaches can be practical because they are easy to keep and come in many sizes. Crickets are widely available, but they should be used thoughtfully because they can injure a vulnerable mantis if left loose in the enclosure, especially during premolt or after a bad shed.

Avoid wild-caught insects from areas treated with pesticides or herbicides. These insects may carry chemical residues or parasites. Fireflies are especially important to avoid because they can be toxic to many insect-eating animals.

It is also wise to avoid prey that is too large, heavily armored, or aggressive for the mantis's size. Oversized crickets, large mealworms, and strong beetles can stress or injure a mantis. Dead prey is often ignored, and spoiled insects should never be offered.

There is no single schedule that fits every species, but smaller and younger mantises usually eat more often than adults. Hatchlings may need food every day. Growing nymphs often eat every 1 to 2 days. Adults commonly eat every 2 to 4 days, depending on species, temperature, prey size, and whether a molt or egg production is approaching.

Watch the abdomen for clues. A very flat abdomen can mean the mantis is ready to eat, while a rounded abdomen often means it has had enough. Overfeeding can increase fall risk after climbing and may contribute to messy molts in some setups, so feeding by body condition is more useful than following a rigid calendar.

Most mantises do not drink from bowls. They usually drink droplets from enclosure walls, leaves, or decor after light misting. Hydration needs vary by species and enclosure humidity, but many pet mantises benefit from a light mist once daily or several times weekly, with enough ventilation to prevent stagnant dampness.

Do not soak the enclosure. Constant wet conditions can encourage mold and feeder die-off. If your species comes from a drier habitat, lighter and less frequent misting may be more appropriate.

Large species such as the Chinese mantis can handle larger prey than smaller species like many flower mantises. Chinese mantises are commonly described by extension sources as large mantids, often around 65 to 85 mm as adults, while European mantises are somewhat smaller at about 50 to 65 mm. Carolina mantises are also generally smaller than Chinese mantises.

In practice, that means a Chinese mantis may graduate to bottle flies, larger roaches, and bigger moths sooner, while a smaller species may stay on fruit flies and houseflies longer. Flower mantises often respond especially well to flying prey, while heavier-bodied species may accept a wider range of crawling insects.

A mantis that consistently ignores prey may be too cold, too close to a molt, stressed by enclosure conditions, or being offered the wrong prey size. Repeated falls, weak strikes, a very thin abdomen, or poor growth can also suggest husbandry problems.

If your mantis has trouble shedding, loses limbs, or stops eating for longer than expected outside a molt window, review temperature, humidity, feeder size, and feeder variety. For unusual species or repeated problems, consulting an exotics-focused veterinarian or experienced invertebrate clinician can help.