A lot of people fear spiders because some of them are hazardous. Other people fear the thought of being bitten. Let’s explore spiders generally and give you a few details about common spiders.
Though spiders have simple eyes, they usually aren’t well developed. Instead, spiders use vibrations, which they can feel 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 touch, vibration, and airflow.
Spiders are arthropods, so their skeletal system of the body is the outermost layer. The hard exoskeleton enables the spider keep moisture and not dry out. The bristles are not hair, but really part of the exoskeleton.
Web weavers use the tiny claws at the bottom of each leg, in addition to their notched hairs, to walk on their webs without sticking with 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 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 stomach, 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 net before spinning a new one.
Not all spiders spin webs, but a lot of use silk in different ways. Some protect their eggs in silken egg sacs. Some trap-door spiders create 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. This is pronounced “A Rainy Day.”
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 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.