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Invertebrates · SPECIES PROFILE

Mexican Red Knee

Brachypelma hamorii

Slow-growing terrestrial tarantula; females can live for decades.

Mexican Red Knee (Brachypelma hamorii)
Images · Public domainGeorge Chernilevsky / Wikimedia Commons
Advanced CareRequires More Preparation Update 2026-09-07
Editorial example · Pending Expert Review
Adult Length4.72–6.3 in
Reference Lifespan20–30 yr
Ambient Temperature Reference71.6–80.6 °F
Air Humidity50–65 %
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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.

55/100 · Depends on specific conditions
Beginner suitability52
Handling8
Interactive15
Space81
Cost87
Maintenance66
Travel68
Veterinary Accessibility28
Safety62
RISK SIGNALS
Feeding difficulty 38Environmental control 38Escape risk 36Bite risk 42Toxicity risk 72Noise 99Odor 94Cleaning burden 34
LIFE FIT
Children and families 34Apartments 99Bedrooms 99Frequent travel 62

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.

55/100 · Depends on specific conditions

A better fit if

  • The living conditions need closer planning
  • Adult space is relatively easy to plan, but use the recommended enclosure as the baseline
  • Daily maintenance requires a steady time commitment

Resolve these first

  • Molting window:Do not move or feed during the molting period; temporary inactivity is often natural behavior.
  • Confirm an exotic veterinarian and emergency route before purchase
  • The lifespan is a long commitment and needs a long-term plan
Adult size
4.72–6.3 in
Reference Lifespan
20 to 30 years
Minimum space
Low, horizontal enclosure with deep substrate and hides; limit distance from top to ground to prevent falls.
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

  • Molting windowDo not move or feed during the molting period; temporary inactivity is often natural behavior.
  • Safe handlingAppearing calm does not mean there is no risk; prepare tools, containers, and an allergy emergency plan first.
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
Mexican Pacific Coast.
Body Size and Diameter
Leg span. Lifespan refers to females; males usually live for less time.
Dietary Habits
Carnivore
Activity Cycle
Active mostly at night or dusk; minimize disturbance during molting.
Availability of Captive-Bred Individuals
Moderate
Temperament and Aggression
Startled spiders may kick urticating hairs or bite; apparent docility does not equal safety.
Toxicity and Contact Risks
Venomous and possesses irritating urticating hairs. Contact Risks: Medium。
Socialization and Handling
Strict solitary housing; handling is not recommended.

Environmental Parameters

Temperature Gradient

Avoid direct heat sources and overheating; provide temperature gradient zones.

Humidity and Ventilation

50 to 65%. Prioritize ventilation and water availability. Do not soak the entire enclosure to increase humidity.

Lighting and Circadian Rhythm

Dim ambient light; maintain stable circadian rhythm.

Basking Spot / Localized Heat

Avoid direct heat sources and overheating; provide temperature gradient zones.

UVB Requirements

Dim ambient light; maintain stable circadian rhythm.

Adult Space

Minimum: Low, horizontal enclosure with deep substrate and hides; limit distance from top to ground to prevent falls.
Recommended: Low, horizontal enclosure with deep substrate and cover; limit drop distance from top to ground. Recommended setup adds approximately 20% more substrate and hiding space on the minimum floor area to facilitate molting and cleaning.

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

Rotate prey; control feeding based on abdominal condition. Wait for fangs to harden after molting before feeding.

Feeding Frequency
Typically every 1 to 2 weeks, pause and observe condition before and after molting.
Live Prey Requirement
Required
Rodent Pellets
Not Required

Enclosure and activity space

Low, horizontal enclosure with deep substrate and hides; limit distance from top to ground to prevent falls.

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

Is it the same as B. smithi?

No. Trade names are often used interchangeably. Records and provenance documents should identify the precise scientific name.

Can I start keeping this animal based solely on this record?

No. This is a summary plan for a healthy adult. Juveniles, breeding periods, disease states, and regional climate variations require separate assessment.

Risks and Legality

  • Long lifespan and proof of trade origin must be evaluated first.
  • Before acquiring, verify reliable sources, long-term care capability, and local exotic animal veterinary resources.

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

Further reading. Some entries are group data. Numerical values and spatial recommendations are compiled by editors and have not been reviewed field-by-field by experts.

View data scope and update methods ↗
SIMILAR SPECIES

Other options within the same group

Similar species does not mean they can be co-housed