A study at the University of Rennes in France found that wolf spiders died after 24 to 36 hours of being immersed in water. But when the scientists came back to weigh the dead spiders, they found them alive again. Apparently wolf spiders can put themselves into comas and shut down the metabolic processes that do not require air. Arachnologist Julien Pétillon says,
"There could be many other species that could this this that we do not know of yet."