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FACTS ABOUT: spiders spider

Definition: spider  Play spiderpronunciation  A spider is a small animal with eight legs and a body made up of two parts. Most spiders spin webs
in which they nest and catch insects to eat. Spiders are related to mites, ticks, and scorpions.

Fun Facts

1. Spider silk is five times stronger than steel. Weight for weight, spider silk is stronger than high-grade steel cable and tough enough to stretch up to 140% of its length without snapping! If a spider web thread were as thick as a pencil, it could stop a flying jumbo jet in mid-air.

2. Spiders are arachnids, not insects. Insects have six legs and three body segments, but spiders have eight legs and two main body parts: the cephalothorax (head and chest combined) and the abdomen. They also don't have wings or antennae!

3. Not all spiders build webs to catch food. While orbital weavers construct classical sticky webs, jumping spiders, wolf spiders, and tarantulas hunt on foot! They use keen eyesight, speed, or camouflage ambush trapdoors to catch their prey instead of relying on web traps.

4. Spiders don't get stuck in their own webs. A spider knows which threads in its web are coated in sticky droplets and which lines are non-sticky structural spokes! Plus, the special claws on the tips of their feet feature non-stick coatings that help them glide across sticky silk seamlessly.

5. Jumping spiders can jump up to 50 times their own body length. Instead of using giant muscular legs like grasshoppers, jumping spiders use a sudden burst of internal hydraulic pressure! They pump liquid into their hind legs to instantly extend them and launch themselves through the air.

6. Spiders eat millions of pest insects every day. Spiders are giant heroes for farms and gardens! Scientists estimate that all the spiders on Earth combined eat between 400 million and 800 million tons of insects every year—protecting our food crops from plant-eating pests.

7. The largest spider in the world is as big as a dinner plate. The Goliath birdeater tarantula from South America can have a leg span up to 12 inches across and weigh as much as a young puppy! Despite its name, it mostly eats frogs, worms, and small lizards.