Tarantulas

Tarantulas (family Theraphosidae) are the world's largest spiders, with over 60 species recorded in Mexico. Species like Brachypelma hamorii (red-knee tarantula) are iconic to Mexican fauna. Although generally not aggressive or dangerous to humans, their large size causes alarm when they enter homes or facilities.

Identification

• Size: Body 5 to 10 cm; leg span up to 15 cm or more.
• Color: Dark brown, black, or with red/orange markings depending on species.
• Body: Robust and hairy with prominent chelicerae.
• Habitat: Ground burrows, forested areas, gardens, basements, and storage areas.
• Activity: Nocturnal. Males are more visible during mating season when searching for females.

Frequently Asked Questions

Are tarantulas dangerous? Their bite is comparable to a bee sting. The greater risk is the urticating hairs they can release from their abdomen, causing skin and eye irritation.

Is it legal to kill tarantulas in Mexico? Several species are protected under NOM-059-SEMARNAT. Capture and relocation by qualified personnel is preferred.

Hazards

Tarantulas pose a low risk to human health. Their bite causes local pain and swelling comparable to a bee sting. Urticating hairs can cause dermatitis and conjunctivitis. The main impact is psychological: their presence can cause panic and is unacceptable in commercial and hotel environments.

Control and Prevention

• Access sealing: Close cracks and ground-level openings where they can enter.
• Exterior lighting: Reduce lighting that attracts insects (tarantula prey) near entrances.
• Vegetation management: Keep gardens trimmed and free of debris where they can shelter.
• Capture and relocation: Humane handling by trained personnel, respecting protected species.
• Perimeter control: Application of residual insecticides around the structure perimeter.