Goliath bird-eating spider

Goliath bird-eating spider

World's biggest tarantula


South America
South America
Endangered Status



up to 11
inches long
A pencil is 7.5 inches long.
Goliath bird-eating spider size compared to a pencil
meat, more

These huge spiders don’t usually eat birds. Their usual prey are larger insects, neighbor spiders, frogs, and salamanders. Once in a while one might catch a lizard, mouse, snake, or a bird.



Goliath bird-eating spider spiderling


A female Goliath bird-eating spider lays about 70 eggs. She guards her eggs, keeping them safe in a sac she spins of silk. Spiderlings (baby spiders) hatch from eggs. Most spiderlings are tiny, but not these. They are nearly 0.75 inches long. Spiderlings hang around for a two or three weeks before they go off on their own. They eat a lot and grow fast.

Spider shedding its exoskeleton

Time to grow

All spiders have a hard exoskeleton. To grow, they must shed it. When the time comes, they grow a stretchy, new exoskeleton underneath the old one. Then a tarantula makes a mat of silk and flips onto its back to lay on it. The old exoskeleton opens on the back, and the spider pushes it off. The spider grows quickly, before the new exoskeleton hardens. Then, it flips back over. Young tarantulas molt several times over the first few years as they get bigger.

Spider at the enterance to its cave.

Nighttime hunters

These big spiders don’t weave round webs to catch prey. They hide in underground burrows during the day. At night, they come out to hunt among the leaf litter. The spider’s long fangs inject venom that kills its prey. The next step is to start digesting its food—even before food is in the spider’s mouth. The spider injects prey with digestive juices and sucks up the liquified prey.

Hairy leg of bird-eating spider.

Scary hairs

Like other tarantulas, these spiders defend themselves with hair—but not just any hair. With its hind legs, an alarmed spider flicks hairs from its abdomen. These hairs are called urticating (ER-tick-ate-ing) hairs. They are barbed, and they lodge in a would-be attacker’s eyes, mouth, or face. In humans, these hairs can be painful and itchy. Good thing tarantulas only flick them when threatened.