Tarantulas

Tarantulas at a glance

Need to know

• Tarantulas use urticating hairs as a defensive weapon against predators.
• Despite their size and fearsome appearance, tarantula bites are rarely dangerous to humans.
• Some tarantulas can live up to 30 years, with females typically outliving males by many years.
• Tarantulas occur on every continent except Antarctica, primarily in tropical and subtropical areas.
• The Goliath Birdeater (Theraphosa blondi) is the world’s largest spider by mass.

About the Tarantulas

Tarantulas represent one of the largest and most recognizable groups of spiders, famed for their formidable size, hairy bodies, and docile natures. Distributed across Africa, the Americas, Asia, and even parts of Europe and Australia, these impressive arachnids thrive in varied environments from deserts to rainforests. Their hunting is mostly nocturnal, relying on stealth and speed to ambush prey from burrows or concealment.

While the sight of a tarantula can inspire fear, their venom is typically mild to humans, and their biggest threats are not people but habitat loss and pet trade overcollection. Tarantulas' long lifespans, fascinating behaviors like molting, and varieties of color make them one of the most studied and beloved spider families.

Physical characteristics

Size: 4.5–28 cm legspan depending on species. Weight: 40–130 grams depending on species. Lifespan: Females average 10–25 years; Males 5–8 years.

• Large, robust, hairy body and legs
• Fangs that strike downward
• Eight eyes arranged in two rows
• Prominent urticating hairs (New World species)
• Distinctive coloration and banding on some species

Notable species

• Goliath Birdeater (Theraphosa blondi) — Not Evaluated. Tropical rainforest floor, especially near swampy and marshy areas Regions: Amazon Rainforest, northern Brazil, Guyana, Suriname, southern Venezuela.
• Mexican Redknee Tarantula (Brachypelma smithi) — Near Threatened. Dry scrublands and forests along Pacific Coast Regions: Mexico, Pacific Coast of Mexico, Sinaloa, Guerrero, Western Mexico.
• Chilean Rose Tarantula (Grammostola rosea) — Not Evaluated. Arid scrub and desert brush in semi-desert areas Regions: Chile, Bolivia, Argentina, Atacama Desert, Pacific Coast of South America.
• Cobalt Blue Tarantula (Cyriopagopus lividum) — Not Evaluated. Tropical forests with deep, moist burrows Regions: Thailand, Myanmar, Cambodia, Southeast Asia tropical forests.
• Indian Ornamental Tarantula (Poecilotheria regalis) — Endangered. Tree trunks in moist, deciduous forests Regions: India, Eastern Ghats, Southeast India, Andhra Pradesh, Karnataka.
• Pinktoe Tarantula (Avicularia avicularia) — Not Evaluated. Tropical rainforest canopies Regions: northern South America, Guyana, Suriname, Venezuela, Brazil, French Guiana.

Habitat and range

Original range: Believed to have originated in tropical regions of South America and Africa, diversifying into drylands and tropical forests worldwide.

Current distribution: Now found in tropical, subtropical, and some arid/semi-arid regions of every continent except Antarctica.

Preferred environments: tropical rainforest floor, deserts and scrublands, semi-arid grasslands, woodland and forest edges, tree canopies (arboreal species)

Regions: Amazon Rainforest, Atacama Desert, Central America, South America (multiple regions), Mexico, southern United States, Southeast Asia, India, Africa (central and southern regions), Australia

Where to see Tarantulas

• Amazon Rainforest — Wet season (November to May). Look for large burrows at the base of trees or in leaf litter after dark.
• Mexico's Pacific Coast — Late summer and autumn (rainy season). Spot Mexican Redknee Tarantulas at dusk as they emerge from burrows.
• Atacama Desert, Chile — Spring and early summer. Observe Chilean Rose Tarantulas at night after storms when prey is abundant.
• Western Ghats, India — Monsoon and post-monsoon seasons. Look for Indian Ornamental Tarantulas in crevices of old tree trunks.

Behavior and diet

Diet: Primarily insects, but also small mammals, amphibians, reptiles, and occasionally small birds.

Social structure: Mainly solitary except during mating; usually aggressively territorial.

Communication: Communicate through vibrations, body postures, leg tapping, and pheromones.

• Flicking urticating hairs as defense
• Performing elaborate courtship rituals
• Burrow construction and web lining for sensing prey
• Molting to grow and sometimes regenerate lost limbs

Interactions with other animals

• Small mammals (e.g., mice) (predator): Tarantulas will ambush and inject venom into small mammals when encountered.
• Wasps (especially Tarantula hawk wasp) (prey): Tarantula hawk wasps paralyze tarantulas to lay eggs on them; larvae consume the spider.
• Birds (prey/competitor): While rare, some birds prey on young/off-guard tarantulas; some tarantulas have been known to prey upon nestling birds.

Conservation

IUCN Red List status: Not Evaluated (most species); some species Endangered or Near Threatened

Threats

• Habitat destruction and deforestation
• Illegal wildlife/pet trade
• Pesticide and chemical exposure
• Wild collection for traditional medicine

Conservation efforts

• CITES listing of several species to restrict trade (e.g., Mexican Redknee)
• Habitat conservation in biodiversity hotspots
• Education about ethical pet ownership
• Research on wild populations and sustainable use

How to help

• Avoid purchasing wild-caught tarantulas as pets
• Support conservation organizations protecting rainforests
• Educate others about the ecological role of tarantulas
• Advocate for sustainable land-use practices in tropical regions

Tarantulas facts for kids

Tarantulas are very big, hairy spiders that live in warm places all over the world. They look scary, but most are gentle and help control insect pests. Some can even live for 30 years!

• Tarantulas can have legs as long as a ruler!
• They can regrow lost legs after a molt.
• Some tarantulas kick itchy hairs to scare away animals.
• Many tarantulas have cool colors like pink, blue, and orange.
• They mostly eat bugs, not birds!

Did you know? Did you know? The Goliath Birdeater tarantula is as big as a dinner plate—the largest spider in the world!

Watch & learn

• Tarantulas: Masters of Ambush - Venomous Predator Documentary — Smithsonian Channel. This documentary explores the fascinating hunting strategies and adaptations of tarantulas (Theraphosidae), capturing their roles as both predators and prey in diverse ecosystems. Features high-quality close-up footage and expert narration.
• The Truth About Tarantulas - Nature’s Gentle Giants — PBS Nature. PBS Nature dispels myths about tarantulas and examines their life cycles, habitat, and surprising behaviors through engaging and educational storytelling, emphasizing their role in ecological balance.
• Goliath Birdeater: The World’s Largest Spider — BBC Earth. A stunning segment on the Goliath birdeater (Theraphosa blondi), the largest member of the tarantula family, exploring its hunting methods, size, and adaptations. BBC Earth’s vivid visuals bring the giant spider to life.
• Secrets of Tarantulas: Stealthy Hunters of the Night — National Geographic Wild. National Geographic Wild investigates tarantulas’ nocturnal habits, silk-spinning, and defensive postures—in-depth, science-based footage highlights their evolutionary success among arachnids.
• Inside the Web: Amazing Facts About Tarantulas — Smithsonian Channel. Dive into the complex biology and ethology of tarantulas, including their molting process, fangs, and unique communication signals. Smithsonian delivers rich, educational content with expert interviews.