Theraphosa blondi — Goliath Birdeater (Sling)

The World's Largest Tarantula — A True Giant in the Making

The Goliath Birdeater Sling is one of the most legendary tarantulas in existence. Theraphosa blondi holds the title as the largest tarantula on Earth by mass, and raising one from a sling is a truly rewarding journey for any serious keeper.

Massive, powerful, and covered in dense setae, this species offers an impressive presence and unmatched scale once fully grown.

Why You'll Want This Species

• One of the largest tarantulas in the world

• Thick, powerful build with a commanding presence

• Fascinating growth from tiny sling to giant adult

• A centrepiece species for advanced collections

• Unique behaviours, including stridulation (hissing sound)

Quick Facts

• Scientific Name: Theraphosa blondi

• Common Name: Goliath Birdeater

• Origin: Northern South America (Amazon rainforest regions)

• Adult Size: Up to ±25–30 cm leg span

• Temperament: Defensive, sensitive, ground-dwelling

• Lifespan:

  • Females: ±15–20 years

  • Males: ±3–5 years

Appearance

• Dark brown to earthy tones with a dense, hairy body

• Thick legs built for power rather than speed

• Prominent fangs and robust overall structure

This species is not about bright colours — it's about sheer size, texture, and presence.

Enclosure & Setup Guide (By Life Stage)

Sling

• Enclosure: Small, well-ventilated sling enclosure

• Substrate Depth: 5–8 cm (moist but not waterlogged)

• Setup: Small hide, stable humidity, good airflow

• Tip: Slings are sensitive — balance humidity with ventilation carefully

Juvenile

• Enclosure: Small terrestrial enclosure

• Substrate Depth: 8–12 cm

• Setup: Hide, water dish, slightly moist substrate

Sub-Adult

• Enclosure: Medium enclosure with increased floor space

• Substrate Depth: 12–15 cm

• Setup: Large hide, water dish, stable humidity

Adult

• Enclosure: Large terrestrial setup (more floor space than height)

• Substrate Depth: 15–20 cm

• Set up Essentials:

  • Spacious floor area

  • Large water dish (important for hydration)

  • Moist substrate with good ventilation

  • Minimal décor to allow movement

Ideal Conditions:

• Temperature: 24–28°C

• Humidity: 75–85% (consistent moisture required)

• Lighting: Low light preferred

• Ventilation: Critical — avoid stagnant, damp conditions

Feeding Guide

• Diet: Crickets, roaches, worms; larger prey as it grows

Feeding Schedule:

• Slings: 2–3 times per week

• Juveniles: Once per week

• Sub-adults: Every 7–10 days

• Adults: Every 10–14 days

Known for a strong feeding response, though individuals may fast during premolt.

Behaviour & Handling

• Defensive when disturbed

• Equipped with urticating hairs that are highly irritating

• Produces a hissing/stridulating sound as a warning

• Handling is not recommended

This species is best appreciated as a display and observation animal.

Important Considerations

• Venom: Mild (New World), but hairs are highly irritating

• Humidity Sensitivity: Requires careful balance — too wet or too dry can cause issues

• Size Commitment: Grows into a very large, space-demanding tarantula

• Experience Level: Intermediate to advanced

Why Start With a Sling?

Starting with a sling allows you to:

• Experience the full transformation into one of the world's largest tarantulas

• Gradually adapt your setup as it grows

• Build confidence managing humidity-sensitive species

Ready to Raise a True Giant?

The Goliath Birdeater Sling is perfect for keepers who want scale, presence, and a truly impressive long-term project.

Secure yours today — a few species command attention like this one.

Photo credit: Syrio via Wikimedia Commons