A lot of people fear spiders because some of them are poisonous. Other men and women fear the thought of being bitten. Let’s explore spiders in general and give you a few facts about common spiders.
Though spiders have simple eyes, they usually aren’t well developed. Instead, spiders use vibrations, which they may sense on the surface of the web. The tiny bristles distributed all over a spider’s body surface, are actually sensitive tactile receptors. These bristles are sensitive to many different stimuli including vibration, touch, and airflow.
Spiders are arthropods, so their skeletal system of their body is the outermost layer. The tough exoskeleton enables the spider maintain moisture and not dry out. The bristles aren’t hair, but actually part of the exoskeleton.
Web weavers use the tiny claws at the base of each leg, along with their notched hairs, to walk their webs without sticking with them.
Spiders digest their food outside their body. After the prey is captured, spiders release digestive enzymes in their intestinal tract and cover the insect. These enzymes break down the body, which allows the spider suck up the liquid prey.
The feared tarantula is not poisonous. A tarantula’s bite can be painful, but it is not any more dangerous than a bee sting.
A Daddy-long-legs is not a spider, though it looks a lot like one. It doesn’t have a waist between its front body part and its abdomen. Its legs are longer and thinner than a spider, and it carries its body hung low.
Below a spider’s abdomen, near the back, are tiny stubs called spinnerets. The spider uses its legs to pull liquid silk made in its abdomen from the spinnerets. The silk hardens as it stretches. Since silk is made out of protein, a spider eats the used silk of an old web prior to turning a fresh one.
Not all spiders spin webs, but a lot of use silk in different ways. The Wolf Spider carries her egg sac attached to her spinnerets. Some trap-door spiders make silken lids due to their burrows.
On an American one-dollar bill, there’s an owl in the upper left-hand corner of the”1″ encased in the”shield” and a spider hidden in the front upper right-hand corner. Most spiders belong to the orb weaver spider family, Family Aranidae.
A strand from the web of a golden spider is as strong as a steel wire of the exact same size.
In the 1960s, animal behavior researchers studied the effects of various substances on spiders.
When spiders were fed flies which had been injected with caffeine, they spun very”nervous” webs. When spiders ate flies injected with LSD, they spun webs with wild, abstract patterns. Spiders which were given sedatives fell asleep before completing their webs.