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Spiders obtain their oxygen through four respiratory organs located on the underside of their abdomens. These organs are arranged into two pairs, an anterior pair at the very front end of the abdomen, and a posterior pair behind the anterior pair.
The spiders are also good swimmers, usually working from the sides of pools and off rocks. They can also been seen sculling across the surface with their two middle pairs of legs. When disturbed or hauling in captured fish, they will plunge through the surface of the water and swim quickly to hide on the bottom.