Can Tarantulas Live Together? Risks of Cohabitation and Cannibalism

Introduction

Most pet tarantulas should be housed alone. While a few species are described by experienced keepers as more tolerant of group setups, tarantulas are generally not social pets in the way rats, guinea pigs, or some reptiles can be. In captivity, putting tarantulas together can lead to chronic stress, competition for hides and food, injury during molts, and cannibalism.

That risk is highest when tarantulas are mismatched in size, sex, feeding status, or molt stage. Even if two spiders appear calm for weeks or months, conflict can happen suddenly. A recently molted tarantula is especially vulnerable because its body is soft and defensive behavior is limited.

For most pet parents, the safest and most predictable option is one tarantula per enclosure. If your tarantula stops eating, loses condition, has trouble molting, or is injured after contact with another spider, schedule an appointment with your vet. A reptile- and invertebrate-experienced veterinarian can help you assess husbandry, hydration, wounds, and next steps.

Why cohabitation is risky

Tarantulas do not need companionship to thrive in captivity. Their normal behavior is built around finding shelter, avoiding predators, and securing prey. In a shared enclosure, those same instincts can turn into competition over burrows, web space, water access, and feeding opportunities.

Stress may be subtle at first. One spider may stay exposed instead of using a hide, stop eating, pace the enclosure, or remain pressed against the walls. Another may monopolize the best retreat or food items. Because tarantulas cannot communicate social boundaries the way many mammals do, conflict often escalates through avoidance, defensive posturing, or attack rather than stable group living.

Cannibalism can happen without warning

Cannibalism is one of the main reasons most keepers avoid communal housing. A hungry tarantula may attack a smaller cage mate, but size is not the only factor. Freshly molted spiders, weakened spiders, and individuals disturbed during feeding are also at risk.

This can happen quickly and sometimes overnight. Pet parents may only notice missing legs, puncture wounds, a collapsed abdomen, or that one tarantula has disappeared entirely. If there has been any fighting or suspected cannibalism, separate the spiders immediately and contact your vet if the surviving tarantula is bleeding, weak, or unable to stand normally.

Are there any exceptions?

A small number of species are discussed in the hobby as more suitable for communal setups, especially some spiderlings raised together under tightly controlled conditions. Even then, communal success is not guaranteed. It depends on species identification, enclosure design, abundant space, multiple hides, close size matching, careful feeding, and constant monitoring.

That means communal housing is usually an advanced husbandry project, not a routine pet setup. For most pet parents, and especially for beginners, solitary housing is the lower-risk choice. If you are considering a group enclosure, talk with your vet and confirm the exact species before trying it.

When to involve your vet

Your vet can help when behavior changes may reflect stress, dehydration, injury, or a husbandry problem rather than temperament alone. Reach out if your tarantula has wounds, a shrunken abdomen, repeated falls, trouble walking, prolonged refusal to eat with weight loss, or a difficult molt after being housed with another spider.

A non-emergency exotic visit in the United States often falls around $90-$180 for an exam, with added cost for wound care, fluids, imaging, or hospitalization if needed. Calling ahead matters, because not every clinic sees tarantulas or other invertebrates.

Questions to Ask Your Vet

Bring these questions to your vet appointment to get the most out of your visit.

  1. Does my tarantula’s species have a strong reputation for solitary housing, or are there any limited exceptions?
  2. Are the behavior changes I am seeing more consistent with stress, premolt, dehydration, or illness?
  3. If two tarantulas were housed together, what injuries should I check for right away?
  4. How should I set up a separate enclosure for recovery after a fight or stressful cohabitation attempt?
  5. What signs during or after a molt mean my tarantula needs urgent veterinary attention?
  6. Is my enclosure size, humidity, temperature, and hide setup appropriate for this species?
  7. If my tarantula has a wound or is bleeding, what first-aid steps are safe before the appointment?
  8. Do you recommend any follow-up monitoring after an injury, failed molt, or prolonged fasting?
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