fortunatly, they tended to stay off the ground, but talked a being creeped out....egads

fortunatly, they tended to stay off the ground, but talked a being creeped out....egads

Originally posted by Krono
Thank you for your replies. I think scientist have already de-bunked this. They state that spider can't become giants (when I mean giants I don't mean 100ft tall!) due to the low oxygen levels in the air. They said if they were big, they wouldn't be able to breath in enough oxygen to survive.
"We took the beetles to the Argonne National Lab and put the live animals under the x-ray beam," he says. "We took video sequences and x-ray images of the live beetles, then we went back to Tempe and sat down at a computer and measured the tracheal volume, the dimensions of the structures." They found that the larger beetles had to devote a greater proportion of their body mass -- up to 20 percent more -- to the tracheal system than the smaller beetles. It's the proportion of tracheal system to body mass that matters because as the insect grows larger, it must devote more and more of its resources to maintain a tracheal system that is robust enough to deliver enough oxygen to the body's tissues.While looking up pre#oric dragonflies...
They found that the larger beetles had to devote a greater proportion of their body mass -- up to 20 percent more -- to the tracheal system than the smaller beetles. It's the proportion of tracheal system to body mass that matters because as the insect grows larger, it must devote more and more of its resources to maintain a tracheal system that is robust enough to deliver enough oxygen to the body's tissues.
What that means, the scientists say, is the size of the tracheal system makes it possible for some insects to get bigger, but it also limits the maximum size.

Aftermarket cold air intake systems are marketed with claims of increased engine efficiency and performance. The putative principle behind a cold air intake is that cooler air has a higher density, thus containing more oxygen per volume unit than warmer air.Wiki In colder environments, the air is denser--also, the air tends to be far less humid. We think about these things for combustion engines.
Now, Pennings and Ho report that three different herbivores all grew bigger on a diet of high-latitude plants than on a lower-latitude diet. Pennings says the plants from cold climates appear to have more nitrogen, which makes them more nutritious, and have fewer toxic defense chemicals. They're also softer and easier to eat. And it may be that bigger herbivores make the predators that eat them bigger too. I'm Bob Hirshon for AAAS, the Science Society.
Originally posted by blocula
if all spiders were 2 or 3 feet across in size. i don't think that humans would have been able to evolve to the point we are at right now, if at all... spiders at those sizes would be really, really fast and they are ambush predators...
here's the biggest known spider > en.wikipedia.org...edit on 2-10-2011 by blocula because: (no reason given)
The Goliath bird-eater Spider (Theraphosa blondi; also called the Goliath Birdeater) is an arachnid belonging to the tarantula group, Theraphosidae, and is considered to be the second largest spider in the world
Originally posted by fooks
reply to post by clearmind
yes!
i lived in FL and they would make webs between trees that were quite wide.
my brother road his horse through one and the spider landed on his back!! lololol!!
almost fell off my horse, laughing! he freaked!
got some biggies here in HK too. got some pics somewhere.
one was in my bathroom and ran out from behind my shelf on the wall next to me at head height, while i was shaving,
almost cut my throat! lol!
got him though, 1/2 a can of roach killer.
sorry, but not in my house, big guy!
edit on 2-10-2011 by fooks because: (no reason given)edit on 2-10-2011 by fooks because: (no reason given)