The Heavyweight King of Spiders
Weighing up to 175 grams (6.2 ounces) with a leg span reaching 30 centimeters (12 inches), the Goliath birdeater (Theraphosa blondi) is the largest spider in the world by mass.
Despite its historical name coined from an 18th-century copper engraving, it rarely eats birds. It is an opportunistic ground hunter that stalks large earthworms, crickets, frogs, and small vipers across swampy forest floors.
Acoustic Hissing and Barbed Hair Artillery
When threatened, the Goliath birdeater rubs the specialized bristles on its front legs and pedipalps together, producing a loud, raspy hissing sound audible from several meters away.
If the intruder continues to approach, the spider uses its hind legs to vigorously scrape its abdomen, launching a dense cloud of microscopically barbed urticating hairs into the air. These hairs cause severe burning and swelling in the eyes, skin, and respiratory tracts of mammals.
Two-Inch Fangs and Liquefying Venom
If forced to bite, the spider deploys curved, hollow fangs measuring up to 3.8 centimeters (1.5 inches) long, larger than the fangs of most rattlesnakes.
While its venom is not lethal to healthy humans, the immense puncture wound and digestive enzymes produce intense localized pain, swelling, and cramping for hours.
