From rainforest giants to cave-dwelling hunters, the world is home to some truly massive spiders. These extraordinary species stand out for their incredible size, powerful hunting abilities, and unique adaptations. Whether measured by leg span or weight, each spider on this list showcases the extremes of arachnid evolution. This guide highlights the fifteen biggest spiders on Earth, offering a clear look at their size, habitats, and defining characteristics.
1. Goliath Birdeater (Theraphosa blondi)
The Goliath Birdeater is widely recognized as the largest spider in the world by weight and one of the most visually striking tarantulas ever discovered. Found in the deep rainforests of South America, this massive species inspires both fascination and fear due to its incredible size and powerful presence.
Identification
- Scientific Name: Theraphosa blondi
- Family: Theraphosidae
- Leg Span: Up to 11–12 inches (28–30 cm)
- Weight: Up to 6.2 oz (175 g)
- Known For: Largest spider in the world by mass
Habitat and Distribution
The Goliath Birdeater thrives in the humid, dense rainforests of northern South America. It is most commonly found in countries such as Suriname, Guyana, Venezuela, and northern Brazil. These spiders typically live in deep burrows on the forest floor, where temperature and moisture remain stable.
Diet and Hunting Behavior
Despite its dramatic name, the Goliath Birdeater rarely eats birds. Its diet primarily consists of insects, small mammals, amphibians, and other invertebrates. It uses its large fangs to inject venom and relies on powerful physical strength to overpower prey, making it one of the most effective hunters among tarantulas.
Size and Physical Features
This giant spider is known for its thick, heavy body and impressively long legs, giving it a truly formidable appearance. Its fangs can reach nearly an inch in length, capable of piercing not just prey but even light materials like leather. The spider’s body is covered in dense urticating hairs, which it can flick defensively when threatened.
2. Giant Huntsman Spider (Heteropoda maxima)
The Giant Huntsman Spider is famous for having the largest leg span of any spider in the world, making it one of the most visually shocking giant spiders ever recorded. Its legs stretch outward in a crab-like shape, giving it an even more intimidating appearance.
Identification
- Scientific Name: Heteropoda maxima
- Family: Sparassidae
- Leg Span: Up to 12 inches (30 cm)
- Weight: Light compared to tarantulas
- Known For: World’s largest spider by leg span
Habitat and Distribution
This enormous huntsman species is native to the deep cave systems of Laos. Its environment is dark, humid, and rocky, allowing the spider to move quickly across walls and ceilings with its long, flexible legs.
Diet and Hunting Behavior
The Giant Huntsman is a fast ambush predator. Instead of relying on webs, it hunts by speed and agility, typically feeding on insects, small lizards, and other invertebrates. Its powerful legs help it lunge forward with incredible precision.
Size and Physical Features
With its wide-reaching legs and flattened body shape, the Giant Huntsman appears even larger than it is. Its legs curve outward like a crab, giving it excellent lateral movement. Though not as heavy as tarantulas, its size and speed make it one of the most astonishing spiders ever found.
3. Brazilian Salmon Pink Birdeater (Lasiodora parahybana)
The Brazilian Salmon Pink Birdeater is one of the world’s largest tarantulas and a standout among large spiders due to its size, striking coloration, and impressive mass. It is considered one of the biggest tarantulas kept by enthusiasts.
Identification
- Scientific Name: Lasiodora parahybana
- Family: Theraphosidae
- Leg Span: Up to 10–11 inches (25–28 cm)
- Weight: Up to 3.5 oz (100 g)
- Known For: Large size and pink-tinted leg hairs
Habitat and Distribution
Native to northeastern Brazil, this tarantula prefers tropical forest floors with warm temperatures and moderate humidity. It often inhabits natural burrows, leaf litter, or logs where it can ambush prey.
Diet and Hunting Behavior
The Brazilian Salmon Pink Birdeater is an active nocturnal hunter. It feeds on insects, frogs, small reptiles, and occasionally small mammals. Its strong fangs and rapid strike make it an efficient predator.
Size and Physical Features
This species is easily recognized by the salmon-colored hairs covering its legs and abdomen. Its body is robust and muscular, contributing to its heavy weight. Despite its intimidating appearance, it tends to be less defensive compared to other giant tarantulas.
4. Brazilian Giant Tawny Red Tarantula (Grammostola anthracina)
The Brazilian Giant Tawny Red Tarantula is a powerful, thick-bodied species known for its calm temperament and impressive size. Among big spiders, it stands out for its long lifespan and striking reddish-brown coloration.
Identification
- Scientific Name: Grammostola anthracina
- Family: Theraphosidae
- Leg Span: Up to 9–10 inches (23–25 cm)
- Weight: Around 2–3 oz (56–85 g)
- Known For: Large size and deep tawny-red coloration
Habitat and Distribution
This species is widespread across Brazil, Uruguay, Paraguay, and northern Argentina. It prefers open grasslands and scrub regions, where it hides in burrows or natural ground cavities to stay cool and protected.
Diet and Hunting Behavior
The Brazilian Giant Tawny Red Tarantula is an opportunistic ambush predator. It feeds on insects, small reptiles, and occasionally small rodents. It relies on its strong fangs and patient waiting to capture prey.
Size and Physical Features
Its body is stocky, with thick legs and a reddish-brown sheen that gives it a distinctive look. While large, this species is known for being relatively gentle and slow-moving, contributing to its popularity among tarantula keepers.
5. Colombian Giant Redleg Tarantula (Megaphobema robustum)
The Colombian Giant Redleg Tarantula is one of the most distinctive big spiders due to its bold leg coloration and defensive posture. Its impressive size and striking behavior make it a well-known species among enthusiasts.
Identification
- Scientific Name: Megaphobema robustum
- Family: Theraphosidae
- Leg Span: Up to 8–9 inches (20–23 cm)
- Weight: Around 2 oz (56 g)
- Known For: Bright red leg bands and powerful build
Habitat and Distribution
This species is native to the tropical rainforests of Colombia and parts of Brazil. It thrives in warm, humid environments and typically stays close to the forest floor, where it hides in burrows, roots, and leaf litter.
Diet and Hunting Behavior
An aggressive ambush predator, the Colombian Giant Redleg feeds on insects, small frogs, and other invertebrates. When threatened, it displays a unique defensive behavior—rearing up and kicking its back legs outward to ward off predators.
Size and Physical Features
The spider’s thick, dark body contrasts with its bright red-orange leg segments, giving it a dramatic appearance. Its legs are strong and muscular, helping it deliver quick strikes during hunting or defense.
6. Chaco Golden Knee Tarantula (Grammostola pulchripes)
The Chaco Golden Knee Tarantula is one of the most recognizable large spiders thanks to its bold golden stripes and impressive size. Despite its massive build, it is known for being gentle and calm in nature.
Identification
- Scientific Name: Grammostola pulchripes
- Family: Theraphosidae
- Leg Span: Up to 8–10 inches (20–25 cm)
- Weight: Around 2–3 oz (56–85 g)
- Known For: Golden knee markings and large, bulky body
Habitat and Distribution
Native to Paraguay and Argentina, this tarantula prefers open grasslands and sandy plains. It lives in deep burrows that help it regulate temperature during hot days and cool nights.
Diet and Hunting Behavior
A patient ambush hunter, the Chaco Golden Knee primarily eats insects, small lizards, and the occasional small rodent. It relies on stealth and timing, striking with precision when prey gets close.
Size and Physical Features
This species is admired for its dark body accented by bright golden bands on the leg joints. It has a thick, heavy frame and long legs, giving it a commanding presence. Its gentle temperament makes it one of the most popular large tarantulas in captivity.
7. King Baboon Spider (Pelinobius muticus)
The King Baboon Spider is one of Africa’s most impressive big spiders, known for its immense size, powerful legs, and highly defensive temperament. It is considered one of the heaviest tarantulas on the continent.
Identification
- Scientific Name: Pelinobius muticus
- Family: Theraphosidae
- Leg Span: Up to 7–8 inches (18–20 cm)
- Weight: Up to 2 oz (56 g)
- Known For: Thick legs, burrowing ability, and aggressive behavior
Habitat and Distribution
This species is native to East Africa, particularly Kenya and Tanzania. It thrives in dry savannas and scrublands, where it digs deep burrows to escape heat and hide from predators.
Diet and Hunting Behavior
A powerful nighttime predator, the King Baboon feeds on insects, frogs, small reptiles, and other invertebrates. It uses its strong hind legs to push soil while digging, and its powerful fangs deliver painful defensive bites.
Size and Physical Features
The spider is easily recognized by its copper-brown coloration and extremely thick legs. Its body is robust and muscular, giving it significant strength. Unlike many tarantulas, it produces a deep, audible “hissing” sound by rubbing its legs—a unique defensive trait.
8. Brazilian Wandering Spider (Phoneutria fera)
The Brazilian Wandering Spider is one of the most feared giant spiders in the world due to its potent venom and active hunting style. While not the heaviest, its leg span and aggressive behavior make it a standout among large spider species.
Identification
- Scientific Name: Phoneutria fera
- Family: Ctenidae
- Leg Span: Up to 5–6 inches (13–15 cm)
- Weight: Light to moderate
- Known For: Highly venomous and fast-moving
Habitat and Distribution
Found mainly in the Amazon regions of Brazil, Colombia, Peru, and Ecuador, this species lives in dense forests, banana plantations, and ground-level vegetation. Unlike web-building spiders, it roams freely at night in search of prey.
Diet and Hunting Behavior
The Brazilian Wandering Spider actively hunts insects, small lizards, and even small mammals. It relies on speed and aggression rather than webs, ambushing prey with rapid lunges powered by its strong legs.
Size and Physical Features
With long, slender legs and a robust body, this spider has a striking appearance. Its defensive posture—raising its front legs high—is well known and serves as a warning to predators. Despite its dangerous reputation, attacks on humans are rare with proper caution.
9. Face-Sized Tarantula (Poecilotheria rajaei)
The Face-Sized Tarantula is one of the most remarkable giant spiders due to its large leg span and striking patterns. Discovered in Sri Lanka, it quickly became known for being large enough to cover an adult human face.
Identification
- Scientific Name: Poecilotheria rajaei
- Family: Theraphosidae
- Leg Span: Up to 7–8 inches (18–20 cm)
- Weight: Moderate
- Known For: Large leg span and ornate body markings
Habitat and Distribution
This species is native to Sri Lanka’s old-growth forests, though habitat loss has pushed many individuals into abandoned buildings and decaying trees. It thrives in warm, humid environments where it can hide in tree hollows or crevices.
Diet and Hunting Behavior
The Face-Sized Tarantula prefers insects and small vertebrates. It uses its speed and powerful bite to subdue prey, often ambushing from within tree cavities. Like many arboreal tarantulas, it relies heavily on vibration detection.
Size and Physical Features
Its long legs are covered with beautiful black, white, and gray patterns, giving it a striking appearance. The spider’s body is flattened, helping it move quickly through narrow spaces. Its size and striking coloration make it one of the most visually impressive tarantulas in Asia.
10. Hercules Baboon Spider (Hysterocrates hercules)
The Hercules Baboon Spider is one of Africa’s rarest large spiders, known for its impressive size and powerful build. Though sightings are extremely limited, it remains legendary among arachnologists and enthusiasts.
Identification
- Scientific Name: Hysterocrates hercules
- Family: Theraphosidae
- Leg Span: Up to 7–8 inches (18–20 cm)
- Weight: Moderate to heavy
- Known For: Rare status and strong, thick legs
Habitat and Distribution
This species originates from Nigeria, but its exact range is poorly documented. It is believed to inhabit humid forest regions, living in deep burrows similar to many other baboon spiders. Very few verified specimens exist in modern collections.
Diet and Hunting Behavior
The Hercules Baboon Spider is believed to feed on insects, small reptiles, and other invertebrates. Like other baboon spiders, it is likely a strong ambush predator, relying on powerful jaws and quick strikes to capture prey.
Size and Physical Features
This spider is characterized by a dark, robust body and thick, muscular legs. Its fang structure is powerful, and its overall build is dense and heavy compared to many other species. Due to its rarity, much about its behavior and appearance is still based on limited specimens.
11. Pinkfoot Goliath Tarantula (Theraphosa apophysis)
The Pinkfoot Goliath Tarantula is one of the largest big spiders on Earth, closely rivaling the Goliath Birdeater in both size and weight. Its long legs and distinctive pink-tipped feet make it a striking member of the Theraphosa genus.
Identification
- Scientific Name: Theraphosa apophysis
- Family: Theraphosidae
- Leg Span: Up to 12 inches (30 cm)
- Weight: Heavy, similar to T. blondi
- Known For: Pink foot pads and extreme leg span
Habitat and Distribution
Native to Venezuela and surrounding regions of northern South America, this species thrives in humid rainforest environments. It typically shelters in burrows or beneath dense vegetation where the moisture level remains high.
Diet and Hunting Behavior
The Pinkfoot Goliath feeds on insects, frogs, small reptiles, and occasionally small mammals. It hunts by ambush, striking rapidly and overpowering prey with strong fangs and significant body weight.
Size and Physical Features
This species is famous for its long, slender legs tipped with pink coloration. Its body is large and powerful, with dense hair that provides protection and sensory function. Among tarantulas, it is one of the most visually distinctive giants.
12. Australian Whistling Spider (Phlogius crassipes)
The Australian Whistling Spider is one of Australia’s most intimidating large spiders, known for the loud hissing or “whistling” sound it produces when threatened. Its size and defensive behavior make it a standout among Australian tarantulas.
Identification
- Scientific Name: Phlogius crassipes
- Family: Theraphosidae
- Leg Span: Up to 8–9 inches (20–23 cm)
- Weight: Moderate to heavy
- Known For: Audible whistling sound and strong build
Habitat and Distribution
Found across northern Australia, especially Queensland, this spider prefers tropical and subtropical regions. It lives in deep burrows in the ground, where humidity stays stable and temperatures remain warm throughout the year.
Diet and Hunting Behavior
The Australian Whistling Spider is a powerful ambush predator. It feeds on insects, frogs, small reptiles, and even small mammals. It uses vibrations and ground movement to detect prey before launching a quick, forceful attack.
Size and Physical Features
Its body is thick and muscular, with long legs covered in dense hair. The spider’s coloration varies from brown to dark reddish tones. Its whistling sound—created by rubbing body parts together—is one of its most recognizable and defensive traits.
13. Mexican Redknee Tarantula (Brachypelma smithi)
The Mexican Redknee Tarantula is one of the most recognizable large spiders, admired for its vivid coloration and calm temperament. Its impressive size and striking orange-red leg joints make it a popular species worldwide.
Identification
- Scientific Name: Brachypelma smithi
- Family: Theraphosidae
- Leg Span: Up to 6–7 inches (15–18 cm)
- Weight: Moderate
- Known For: Bright red-orange knee joints
Habitat and Distribution
Native to the Pacific coast of Mexico, this species thrives in dry scrublands, deserts, and semi-arid regions. It typically shelters in burrows or naturally formed cracks in the ground where temperatures stay stable.
Diet and Hunting Behavior
The Mexican Redknee is a patient ambush predator, feeding mainly on insects but capable of catching small lizards or rodents. It waits quietly near its burrow entrance and strikes when prey moves within reach.
Size and Physical Features
This tarantula is famous for its glossy black body contrasted by orange-red patches on its leg joints. Its long lifespan, calm nature, and bold colors make it a standout species among giant tarantulas.
14. Cobalt Blue Tarantula (Cyriopagopus lividus)
The Cobalt Blue Tarantula is one of the most visually stunning large spiders, known for its brilliant blue legs and fast, defensive nature. Though not the heaviest, its striking appearance and notable leg span make it a standout species.
Identification
- Scientific Name: Cyriopagopus lividus
- Family: Theraphosidae
- Leg Span: Up to 5–6 inches (13–15 cm)
- Weight: Light to moderate
- Known For: Metallic cobalt-blue legs
Habitat and Distribution
This species is native to Myanmar and Thailand, where it lives in deep, humid soil burrows. It prefers dense forest environments and spends most of its life underground, emerging mainly at night.
Diet and Hunting Behavior
The Cobalt Blue is a swift ambush predator. It feeds on insects, roaches, and other invertebrates, relying heavily on speed and aggression to strike prey. It is known for its strong defensive behavior when disturbed.
Size and Physical Features
Its vibrant blue legs—visible when light hits at the right angle—make this tarantula one of the most photographed in the world. Its body is darker and more subdued in color, contrasting beautifully with its luminous limbs. Though smaller than some giants, its appearance keeps it among the most iconic large species.
15. Sri Lankan Ornamental Tarantula (Poecilotheria fasciata)
The Sri Lankan Ornamental Tarantula is one of the most visually striking giant spiders, known for its bold patterns, speed, and impressive leg span. It is one of the largest arboreal tarantulas in Asia.
Identification
- Scientific Name: Poecilotheria fasciata
- Family: Theraphosidae
- Leg Span: Up to 7–8 inches (18–20 cm)
- Weight: Light to moderate
- Known For: Patterned body and fast arboreal movement
Habitat and Distribution
Endemic to Sri Lanka, this species inhabits tree hollows and forested regions with warm, humid climates. Due to habitat loss, many individuals are found in fragmented forest patches, relying on tree cavities for shelter.
Diet and Hunting Behavior
The Sri Lankan Ornamental primarily feeds on insects, moths, and small vertebrates. As an arboreal hunter, it uses speed, vertical movement, and sharp reflexes to capture prey, often striking from above.
Size and Physical Features
This tarantula is easily recognized by its striking white, black, and yellow patterns, giving it a highly ornamental appearance. Its long, slender legs allow for rapid climbing and leaping, making it one of the most agile large tarantulas in the world.