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Message: <blockquote data-quote="DewDrop" data-source="post: 59367" data-attributes="member: 4217">One more thing, book lungs in spiders, they do excrete a little water. So, while there may be no significant water loss, it is the simple fact that they do breathe out a little water that suggests the environment should be humid and not bone dry, even if they come from the desert. They release Co2. Their lungs are not related to modern vertebrates that live on land. Hemolymph is composed of water, salts and organic compounds. The book lung of a spider are air pockets,  tissue is filled with hemolymph . It is thought by scientists that book lungs evolved from book gills. Reference site from^ Foelix, Rainer F (1996). Biology of Spiders. Oxford University Press US. pp. 61–64. ISBN 0-19-509594-4.^ Scholtz, G. & Kamenz, C. (2006) Zoology 109, 2-13; doi:10.1016/j.zool.2005.06.003^ Kamenz, C. et al. (2008) Biology Letters 4, 212-215; doi:10.1098/rsbl.2007.0597^ Bhamrah, H. S.; Kavita Juneja (2002). An Introduction to Arthropoda. Anmol Publications PVT. LTD. p. 316. ISBN 81-261-0673-5.ON digplanet.comBasically tarantulas need a little salt in their systems to survive. They are dependent on chloride, sodium,  for cellular function. THAT** is WHAT I wanted to know. NOT ALL spiders have book lungs, so salt would possibly be a bad thing for those who do not have book lungs. If you can debate this simple fact of tarantula anatomy, please, bring it on.</blockquote>