Exotic Atlas CARE BEFORE COMMITMENT Start Matching
Invertebrates / Species Record
Invertebrates · SPECIES PROFILE

Madagascar Hissing Cockroach

Gromphadorhina portentosa

Group housing, hissing, and breeding rates require more planning than they appear to suggest based on appearance.

Madagascar Hissing Cockroach (Gromphadorhina portentosa)
Images · Public domainAlmabes at English Wikipedia / Wikimedia Commons
Basic CareReady to Start Care Update 2026-09-07
Editorial example · Pending Expert Review
Adult Length1.97–3.15 in
Reference Lifespan2–5 yr
Ambient Temperature Reference75.2–86 °F
Air Humidity60–80 %
IS THIS PET FOR ME? Convert Log to Care Plan
Plan Care Equipment Match by Living Conditions Cost Estimation Compare Pets
Ownership Score

Ownership Score

This is an edited estimate of lifestyle compatibility, not an animal value rating. A higher score indicates that, based on current data, the animal is easier to integrate into your daily routine.

70/100 · Somewhat suitable
Beginner suitability86
Handling26
Interactive18
Space88
Cost92
Maintenance86
Travel84
Veterinary Accessibility22
Safety90
RISK SIGNALS
Feeding difficulty 26Environmental control 32Escape risk 42Bite risk 6Toxicity risk 0Noise 99Odor 94Cleaning burden 34
LIFE FIT
Children and families 60Apartments 99Bedrooms 99Frequent travel 82

The composite score is calculated by weighting nine factors: beginner-friendliness, handling ease, interaction, space requirements, cost, maintenance, travel, veterinary access, and safety. Read risk signals according to field direction: lower scores for biting, escape, and toxicity indicate greater safety; higher scores for noise, odor, and cleaning indicate less hassle. Combine this page's environmental requirements and risk notes with your judgment; do not rely solely on the total score.

BEFORE YOU COMMIT

First check whether it fits your life

This brief brings together the space, maintenance, feeding, lifespan and veterinary conditions recorded on this page so you know what to verify next.

70/100 · Somewhat suitable

A better fit if

  • Most care conditions can be arranged
  • Adult space is relatively easy to plan, but use the recommended enclosure as the baseline
  • The daily maintenance rhythm is relatively easy to schedule

Resolve these first

  • Group breeding:Housing multiple individuals makes population expansion easy, but plan for isolation and relocation before acquiring.
  • Confirm an exotic veterinarian and emergency route before purchase
Adult size
1.97–3.15 in
Reference Lifespan
2 to 5 years
Minimum space
Small groups require at least 17.72 × 11.81 × 11.81 in enclosures with smooth walls, leaving space for ventilation and climbing.
Veterinary Accessibility
Very difficult

This is a comparison aid based on the current record, not a purchase, medical or local-law conclusion. Check the sources and local conditions before continuing.

THINGS OWNERS UNDERESTIMATE

Common Underestimations by Keepers

  • Group breedingHousing multiple individuals makes population expansion easy, but plan for isolation and relocation before acquiring.
  • Ventilation and humidityRequires localized moisture but not a sealed enclosure; damp uneaten food amplifies odor and mold issues.
  • Escape gapsJuveniles can squeeze through small gaps; check locks and edges simultaneously during cleaning and feeding.
VETERINARY ACCESS

Veterinary Accessibility

Very difficult

Routine preventive care is infrequent; management relies primarily on husbandry and specialist consultation.

Extremely difficult; resources are limited when serious injury occurs.

Specialist Exotic Pet Care Typically Required
DATA STATUS

Where this record stands

Editorial example
Last updated
2026-09-07
Fields checked
No field review record yet
Reference sources
1 · Reference sources
Professional review
Pending veterinary or taxonomic review
Local rules
Local rules need verification

Source links are starting points for reading. A group-level guide does not verify every value for each species. Check local rules separately.

Basic Information

Native Distribution
Madagascar forest floor
Body Size and Diameter
Common adult carapace length; see species-specific data for exact carapace width.
Dietary Habits
Detritivore
Activity Cycle
Active mostly at night or dusk; minimize disturbance during molting.
Availability of Captive-Bred Individuals
Moderate
Temperament and Aggression
Typically not aggressive; they hiss or flee quickly when startled.
Toxicity and Contact Risks
Non-venomous. Wash hands after contact; prevent them from entering kitchens and food storage areas. Contact Risks: Low。
Socialization and Handling
Suitable for small-group observation, but prepare isolation and transfer plans in advance for population increases.

Environmental Parameters

Temperature Gradient

Approximately 75.2–86 °F, maintaining a moist side and a ventilated dry side.

Humidity and Ventilation

60 to 80%. Humidity varies with ventilation, misting, and day-night cycles; do not maintain the entire enclosure at a single reading for the long term.

Lighting and Circadian Rhythm

Natural day-night lighting cycles are sufficient; avoid direct high-heat exposure.

Basking Spot / Localized Heat

Not applicable; use gentle ambient heating and avoid localized overheating.

UVB Requirements

Natural day-night lighting cycles are sufficient; avoid direct high-heat exposure.

Adult Space

Minimum: Small groups require at least 17.72 × 11.81 × 11.81 in enclosures with smooth walls, leaving space for ventilation and climbing.
Recommended: Small groups recommended: 23.62 × 15.75 × 15.75 in, provide egg cartons or bark as hiding and vertical enrichment structures.

Substrate and Water

Set depth according to needs of fossorial, burrowing, or decomposer species; avoid pesticides and fertilizers. · Use shallow water dishes or localized water sources; avoid standing water and drowning of juveniles.

These ranges are for planning the environment of a healthy adult, not a constant value for the entire enclosure, and do not cover disease, breeding, or juvenile stages.

Diet and Nutrition

Provide fresh fruits, vegetables, grains, and soil-based food several times weekly; remove uneaten food promptly and replenish clean water.

Feeding Frequency
Provide fruits, vegetables, grains, and humus food several times a week, removing uneaten food promptly
Live Prey Requirement
Not Required
Rodent Pellets
Not Required

Enclosure and activity space

Small groups require at least 17.72 × 11.81 × 11.81 in enclosures with smooth walls, leaving space for ventilation and climbing.

Dimensions are editor suggestions, not mandatory minimum standards in all regions. Group size, individual body size, and layout may require more space.

Frequently Asked Questions

Will they climb out of the enclosure?

Smooth interior walls reduce climbing, but juveniles may still squeeze through gaps; secure lids and ventilation holes.

Do you need to keep many?

Not necessarily. Small groups are easier to observe, but accept that numbers will increase after breeding.

Risks and Legality

  • Juveniles can squeeze through small gaps; check locks and edges simultaneously during cleaning and feeding.
  • Damp uneaten food amplifies odors and mold issues; ventilation cannot be omitted.

Sources and editor notes

This page is a structured editing example and has not yet undergone field-by-field expert review. Reference links are for further consultation; data for some groups may not apply to every species. Please read the full manual before formal husbandry.

Petco Invertebrate Care Sheet

Extended reading for the group; parameters still require verification field by field.

View data scope and update methods ↗
SIMILAR SPECIES

Other options within the same group

Similar species does not mean they can be co-housed