Introducing a New Praying Mantis: Should You Ever House Mantises Together?
Introduction
Most praying mantises should be housed alone. They are ambush predators, not social pets, and many species will attack or eat another mantis if they share space. That risk is highest when mantises are different sizes, underfed, crowded, or close to a molt. For most pet parents, introducing a new mantis to an established one is not recommended.
A small number of keepers report limited success with certain species, especially ghost mantises, in larger and carefully managed communal setups. Even then, co-housing is never risk-free. A mantis that tolerated a tank mate yesterday may injure or kill it today. If you are thinking about trying it, the safest approach is to plan for immediate separation and to have a fully prepared backup enclosure before the new mantis arrives.
If your goal is health, feeding consistency, and safer molts, separate housing is usually the most reliable option. Individual enclosures also make it easier to monitor appetite, hydration, growth, and shed quality. If your mantis stops eating, falls during a molt, or shows an injury, your vet can help you decide what supportive care is reasonable for your species and setup.
Why mantises usually should not live together
Praying mantises are solitary by nature. In captivity, another mantis is often treated as competition or prey rather than a companion. Cannibalism can happen in nymphs, juveniles, and adults, and it is not limited to mating behavior.
Risk goes up when food is scarce, enclosure space is tight, humidity or temperature are off, or one mantis is smaller or weaker. A freshly molted mantis is especially vulnerable because its body is soft for hours after shedding. Even visual stress from nearby mantises can lead to pacing, striking, or repeated attempts to reach the other insect.
Are there any exceptions?
Some keepers attempt communal housing with species considered more tolerant, especially ghost mantises. That does not mean they are truly social or safe to mix routinely. Reports of successful group housing usually depend on same-size individuals, frequent feeding, abundant vertical space, many visual barriers, and close daily monitoring.
Even in these setups, losses can still happen without warning. If you are new to mantis care, communal housing is usually not the best starting point. Separate enclosures are easier to manage and give you clearer information about each mantis's appetite, growth, and molt schedule.
Signs a shared setup is not working
Separate mantises right away if you see stalking, grabbing, missing limbs, torn wings, repeated threat displays, one mantis monopolizing food, or one individual hanging low and avoiding the upper enclosure space. Also separate them before a molt if you cannot closely supervise.
A mantis that is thin, dehydrated, or struggling to molt should never be left with another mantis. These are high-risk situations for injury and cannibalism. If trauma occurs, contact your vet for guidance on supportive care and humane next steps.
Safer alternatives to introducing a new mantis
If you want to keep more than one mantis, the safest plan is side-by-side but separate housing with visual barriers if needed. This lets you maintain species-appropriate humidity, feeding, and perch height for each individual without the added risk of direct contact.
For most common pet mantis setups in the United States in 2025-2026, a basic separate enclosure with ventilation, climbing surfaces, and substrate often costs about $15-$60 per mantis, depending on size and materials. That cost range is usually far lower than replacing animals lost to co-housing mistakes and makes routine care much easier.
Questions to Ask Your Vet
Bring these questions to your vet appointment to get the most out of your visit.
- Does my mantis's species have any realistic history of tolerating communal housing, or is separate housing the safer plan?
- Are there body condition, hydration, or molt-timing concerns that make co-housing especially risky right now?
- What signs of stress, injury, or poor molt recovery should make me separate them immediately?
- If one mantis loses a limb or is bitten, what supportive care is reasonable at home and when should I bring it in?
- What temperature and humidity range is appropriate for my species, and could setup problems increase aggression?
- How should I feed each mantis so I can track appetite accurately if they are housed separately?
- If I already attempted co-housing, what exam findings would tell us one mantis is too stressed or injured to continue?