do all spiders have venom?
482929
I really wish people wouldn't just guess at answers. I know you want the points, but can't you find a question asking for an opinion rather than facts?\n\nYes, all spiders have venom. Spiders can not eat solid food and rely on their venom to liquefy their prey so they can swallow it. All spiders are venomous, without exception.\n\nFortunately most spiders don't have venom that is dangerous to humans. A bite from most spiders has about the same effect as a wasp sting, assuming it can even break the skin.
297688
Whether you believe it or not, THE DADDY-LONG LEGS. It's venom is 10x more potent then the black widow or the brown recluse.  Why don't we think so?  Because it's mouth is to small to bite humans.  IT'S TRUE.
36146
NO. The human body does not contain a condition conducive to spiders. There are thousands of species of spiders, the majority prefer to live outside.  A few spiders prefer to live indoors; common 'house spiders' or 'cobweb spiders' can be found in anyone's home but do not need nor desire a human host.
267800
Try these sites and I also recommend a check up at the doctor:\n\nhttp://spiders.ucr.edu/\nhttp://www.surviveoutdoors.com/emergency/spiderbites.asp
468781
This question is a bit subjective... but (and though I too like whipscorpions) here is a pretty unusual spider:\n\nThe Australian Bird-eating spider, or Whistling Spider (yup, it can whistle)
507399
You're correct about its mouth size--too small to bite humans. It feeds on small insects or the corpses of larger ones. It has a penis, which makes it different from spiders. In fact, the Daddy Longlegs is not technically a spider, although it is an arachnid. I even learned its mating dance. But what I didn't learn was the answer to your question. I ran out of new source material. Despair loomed. Failure before Cecil's eyes is damning indeed.\n\nThen, in the distance, a glimmer of hope. I had visited a slew of arachnid websites, drawing blanks. In desperation, I E-mailed various names from the sites. Just when all seemed lost, Herman Vanuytven came forth from the Arachnology Home page (http://www.ufsia.ac.be/Arachnology/Arachnology.html). Herman's response:\n\n"The problem with the 'Daddy Longlegs' is that the name is used for several kinds of animals, 2 of them arachnids:\n\n1) The family Phalangiidae (a part of the opilionids [harvestmen], a different order than spiders)\n\n2) a spider: Pholcus phalangioides\n\nNumber one doesn't have poison glands. Number two has poison glands but as far as is known in the scientific world, nobody has ever been bitten by one of them. It's not sure if the poison has ever been investigated since there was no need for it."\n\nConclusive proof has yet to be determined.
450140
no, its not a pain response.  spiders are different from us in that they don't move by contracting long muscles as we do.  we move around by the contraction and relaxation of long muscle groups in our bodies.  a spider on the other hand, uses its blood as a hydraulic fluid.  it moves by pumping the blood in and out of the legs, extending and contracting them in the process.  so, when you 'squish' a spider you remove all the blood---and the legs contract as a result of not having any blood pumped into them to extend them.\n\nPS===don't squish spiders.  they are beneficial to us.
933147
Actually a highly venomous spider after death would not be wise to touch. A dead bee if you touch the stinger you will be stung and injected with venom even though it is dead. A poisonous spider would be one that is fatal to eat. The word poisonous and the word venomous in regards to animals have two separate meanings.
252142
Maybe, maybe not. There are alot of insects (ugh) that are crawling or flying around that could leave the same marks.  However, if it even looks like it is starting to rot (for lack of a better word), PLEASE don't delay.  Get to the ER ASAP!!!!!!!I have heard that brown recluse spider bites aren't really noticed as you usually do not know that you have been bitten.  Do a web search on brown recluse spider bites.  I ran across a site one time - wish I could remember the URL.  It had pages and pages of Pictures of people that had been bitten by a brown recluse. They rate each and every one of them.  The ratings are from a 1-5. Of course 5 being the grossest things you will ever want to see.  You can also send your picture of the place where you have been bitten and they will be able to tell if it was indeed a brown recluse.  Good Luck.....
1158257
Spiders  !!!!  all of them
393918
Doesn't sound familiar, but here's a link to an article about North America's "medically significant" spiders. take a look at the photos. If it's not on here, chances are you don't have to worry about it.\n\nhttp://www.royalalbertamuseum.ca/natural/insects/research/dangspid.htm
937339
you have to know alittle about them check out this site its a guide on how to tell if a snake  is venomous\nhttp://www.kingsnake.com/snakegetters/snake.html
796504
Any spider with a "fat round body" as you put it, is most likely a garden spider family Aranaeidae. These are the very commonly spiders that build large round "typical" webs between bushes, trees and on people's front porches. They are very effective at catching and killing large flying insects, so let it be, it'll do more good than evil. None of these spiders are venomous to people, most (even the big ones) arent even able to deliver a bite, so no worries, hope this helps!
347054
More imformation would deffinently help. It is pretty much impossible to tell from the info you gave. What do you mean octagon spider? Does that refer to the web? Some helpful info would be the color, size, and shape of the spider, the shape, size, and location of the web, and where you found the spider (state, country, ect.). Any other information would also help. \n\nAnother thing to consider is that all spiders (other than a small, rare family) have venom. It is unlikely that they are very harmful, but again, I would need more information to say that for sure. Try a field guide (library is a good place to look) and see if you can find what kind it is, then research that one. If you want, post some more info here, and I will try to find it.
403583
Despite it now weighing more than a fraction of an ounce, the Harvestman spider (daddy longlegs) is one of the most deadly organisms. No, it is not able to kill many mammals, but for its size, its venom is more potent than any other venom.
210569
Since spiders dont have an internal skeletal structure the nerves are exposed.  When there legs pull together it is there nerves and muscles spasming  \n\nAlso spiders curle up in a ball when scared so if they die while they are curled up than they will stay that way
732869
No snake's are immune to their own venom