Diving bell spiders only need to come up for air once a day, according to researchers.
The spiders are named for their sub-aqua webs which they fill with air in order to breathe underwater.
Scientists studying the European arachnids measured oxygen levels inside and around an air bubble web.
They found that the bubble acted like a gill, extracting dissolved oxygen from the water and dispersing carbon dioxide.
BBC Nature - Diving bell spiders use bubble webs 'like gills'
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