The Electric Blue Underground Legend

The Cobalt Blue Sling is one of the most visually striking tarantulas in the world, famous for its intense metallic-blue legs set against a dark body. But this beauty comes with attitude.

This is a classic Old World burrowing species: fast, defensive, and rarely seen — making every sighting feel special. Perfect for experienced keepers who appreciate rare flashes of brilliance over constant visibility.

Why You'll Love This Species

• Unreal electric blue legs — one of the most vibrant in the hobby
• Highly sought-after Asian species
• Expert burrower with complex tunnel systems
• Fast & reactive — thrilling to keep
• A true collector's species

Quick Facts

• Scientific Name: Melopoeus lividus (formerly Haplopelma lividum)
• Common Name: Cobalt Blue Tarantula
• Origin: Thailand, Myanmar
• Adult Size: ±12–15 cm leg span
• Temperament: Defensive, fast, reclusive
• Lifespan:
  • Females: ±12–15 years
  • Males: ±3–4 years

Appearance

• Brilliant metallic blue legs (most vivid under good lighting)
• Dark grey to charcoal body
• Sleek, glossy finish

A true "wow" species — when visible, it's absolutely unforgettable.

Enclosure & Setup Guide (By Life Stage)

Sling

• Enclosure: Small burrowing vial or sling enclosure
• Substrate Depth: 5–8 cm (slightly moist, compacted)
• Set up: Starter burrow or angled cork bark
• Tip: Security is key — they settle faster with a burrow option

Juvenile

• Enclosure: Small terrestrial enclosure
• Substrate Depth: 10–12 cm
• Setup: Deep substrate + minimal surface décor

Sub-Adult

• Enclosure: Medium enclosure focused on depth
• Substrate Depth: 12–18 cm
• Setup: Cork bark hide, water dish, low disturbance

Adult

• Enclosure: Terrestrial burrow setup (depth over height)
• Substrate Depth: 15–20+ cm
• Set up Essentials:
  • Deep, slightly moist substrate
  • Water dish
  • Dark, secure environment

Ideal Conditions:

• Temperature: 24–28°C
• Humidity: 70–80% (keep lower layers slightly moist)
• Lighting: Low light preferred
• Ventilation: Balanced airflow

Feeding Guide

• Diet: Crickets, roaches, mealworms

Feeding Schedule:

• Slings: 2–3 times per week
• Juveniles: Once per week
• Sub-adults: Every 7–10 days
• Adults: Every 10–14 days

Expect lightning-fast feeding responses — they strike quickly and retreat to their burrows.

Behaviour & Handling

This is not a beginner tarantula — and should be treated with respect.

• Extremely fast and defensive
• Spends most of its time hidden underground
• Handling is not recommended
• It will stand its ground if disturbed

Ideal for keepers who enjoy natural behaviour observation rather than interaction

Important Considerations

• Venom: Potent (Old World) — medically significant
• Visibility: Low ("pet hole" species)
• Speed: Very fast — always work with caution

Why Start With a Sling?

Raising a Cobalt Blue from a sling allows you to:

• Watch its signature burrowing behaviour develop
• Experience the gradual appearance of its iconic blue colouration
• Build confidence with advanced species care

Ready to Own One of the Most Beautiful Tarantulas in the World?

The Cobalt Blue Sling is perfect for collectors who want something rare, intense, and visually unforgettable.

Limited availability — add this electric blue beauty to your collection today.

Photo credit: Danny de Bruyne via Pixabay