Biggest Spiders in the World

Spiders, with their eight legs and often unnerving appearance, have fascinated and terrified humans for centuries. While most spiders are small and harmless, some of their species have evolved to become true giants of the arachnid world.

In this exploration of the biggest spiders in the world, we will delve into the remarkable diversity of these creatures, their habitats, behaviors, and the intriguing adaptations that have allowed them to thrive.

From the enormous Goliath bird eater to the formidable Huntsman spider, we will embark on a journey through the fascinating realm of colossal arachnids.

Introduction to Giant Spiders

Before we dive into the specifics of individual giant spider species, it’s essential to understand what makes a spider “big” in the arachnid world.

Size is typically measured in terms of leg span, which refers to the distance from the tip of one leg to the tip of the opposing leg when stretched out.

While body size varies between spider species, leg span provides a more reliable measure of their overall dimensions.

Giant spiders are found in various parts of the world, and their sizes can vary significantly. Some are known for their impressive body mass, while others are recognized for their long and spindly legs.

These spiders have adapted to their environments and developed unique hunting and survival strategies that have helped them become the colossal creatures they are today.

The Goliath Birdeater

One of the most famous and largest spiders in the world is the Goliath birdeater, scientifically known as Theraphosa blondi.

This behemoth spider hails from the rainforests of South America, particularly in countries like Brazil, Venezuela, and Suriname.

It is not only renowned for its size but also for its incredible weight and imposing appearance.

Size and Appearance: The Goliath birdeater boasts an impressive leg span of up to 30 centimeters (approximately one foot) and can weigh over 170 grams, making it one of the heaviest spiders in the world. It has a robust body covered in dense, brownish-black hair, which gives it a formidable, yet somewhat endearing, appearance.

Habitat: These massive spiders are found in burrows dug into the forest floor. They are terrestrial and typically avoid climbing trees despite their name. Their burrows serve as both shelter and hunting grounds, where they lie in wait for prey.

Diet: Contrary to their name, Goliath birdeaters primarily prey on insects, small mammals, and amphibians. While they do occasionally capture and consume small birds, this is a relatively rare occurrence. Their diet consists mainly of invertebrates that venture near their burrows.

Behavior: Goliath birdeaters are not known for being aggressive towards humans but may exhibit a threat display when provoked. They can produce a loud hissing sound by rubbing their legs together, which serves as a warning to potential predators or intruders.

The Huntsman Spider

While not as massive as the Goliath birdeater, the Huntsman spider family, scientifically known as Sparassidae, includes some of the largest spider species in terms of leg span.

These spiders are distributed across various regions, including Asia, Africa, Australia, and the Americas. Their name derives from their fast and agile hunting behavior.

Size and Appearance: Huntsman spiders vary in size, but some species can have leg spans exceeding 30 centimeters. They are known for their long, slender legs and flat bodies, which allow them to squeeze into tight spaces.

Habitat: Huntsman spiders are incredibly adaptable and can be found in a wide range of environments, from forests and caves to urban areas. They are known for their propensity to hide in cars, houses, and other man-made structures.

Diet: These spiders are skilled hunters, preying on a variety of insects and small vertebrates. They are known for their speed and agility, often chasing down their prey rather than building webs to trap them.

Behavior: While Huntsman spiders are generally not aggressive towards humans, they can deliver painful bites if provoked or cornered. Despite their intimidating appearance, they are beneficial predators that help control pest populations.

The Giant Huntsman Spider

Among the Huntsman spider family, one of the most noteworthy species is the Giant Huntsman spider, or Heteropoda maxima.

This spider is renowned for its exceptional leg span and is one of the largest known spiders in the world.

Size and Appearance: The Giant Huntsman spider can achieve a leg span of up to 30 centimeters, with its body being relatively small in comparison. Its long legs and brown coloration help it blend into its surroundings, making it a formidable predator.

Habitat: These spiders are primarily found in caves and forested regions in Laos, Vietnam, and other parts of Southeast Asia. They are often discovered hiding in tree bark or crevices.

Diet: As with other Huntsman spiders, the Giant Huntsman preys on insects and small invertebrates. It is a skilled predator, using its speed and agility to catch its prey.

Behavior: While this spider may appear intimidating due to its size, it is generally harmless to humans. It prefers to flee from potential threats rather than confront them.

The Brazilian Wandering Spider

The Brazilian Wandering Spider, belonging to the Phoneutria genus, is another giant arachnid that has earned a fearsome reputation due to its potent venom.

This spider is native to South America and is notorious for its aggressive behavior.

Size and Appearance: Brazilian Wandering Spiders have a leg span that can reach up to 15 centimeters. They are typically brown in color with distinctive patterns on their abdomen.

Habitat: These spiders are found in various habitats, including forests, caves, and human dwellings. They are known for their wandering behavior, often venturing into homes and buildings in search of prey.

Diet: The Brazilian Wandering Spider feeds on a diet of insects, small animals, and other spiders. Their venom is highly potent and is primarily used to immobilize prey.

Behavior: These spiders are known for their aggression when threatened, and their venom is considered one of the most potent among all spiders. While fatalities from their bites are rare, envenomation can lead to severe pain and medical complications.


The world of giant spiders is a fascinating and diverse one, featuring creatures that range from the massive Goliath birdeater to the agile Huntsman spiders.

While these arachnids may inspire fear and fascination in equal measure, it’s crucial to recognize their vital roles in ecosystems as predators of pests and other small creatures.

Understanding the habits, habitats, and behaviors of these giant spiders can help dispel some of the myths and misconceptions that surround them.

Rather than creatures of horror, they are an integral part of our planet’s biodiversity, showcasing the remarkable adaptability and diversity of life on Earth.

As we continue to explore and learn about these fascinating arachnids, we gain a deeper appreciation for the wonders of the natural world and the countless species that call it home.

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