A lot of people fear spiders since some of them are hazardous. Other people fear the thought of being bitten. Let’s explore spiders in general and give you a few details about common spiders.
Though spiders have simple eyes, they typically are not well developed. Rather, spiders use vibrations, which they can sense on the surface of their web. The tiny claws spread all over a spider’s body surface, are actually sensitive tactile receptors. These bristles are sensitive to a variety of stimuli including vibration, touch, and airflow.
Spiders are arthropods, so their skeletal system of the body is the outermost layer. The hard exoskeleton helps the spider keep moisture and not dry out. The bristles aren’t hair, but really part of their exoskeleton.
Web weavers use the tiny claws at the base of each leg, in addition to their notched hairs, to walk their webs without sticking to them.
Spiders digest their food outside their own body. After the prey is captured, spiders release digestive enzymes in their intestinal tract and protect 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, although it looks much 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 own body hung low.
Under 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 in the spinnerets. 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 many use silk in other ways. Some protect their eggs in silken egg sacs. The Wolf Spider carries her egg sac attached to her spinnerets. Some trap-door spiders make silken lids for their burrows.
On an American one-dollar bill, there is 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.
A strand from the web of a golden spider is as strong as a steel wire of the same size.
In the 1960s, animal behavior researchers analyzed the effects of various substances on spiders.
When spiders were fed flies that 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 finishing their webs.