Spins its own div­ing bell

The wa­ter spi­der’s div­ing bell can cap­ture oxy­gen from the wa­ter, so the hunter only needs to go to the sur­face 2-3 times a day.

Science Illustrated - - NATURE/ HUNTING -

COL­LECTS AIR BUB­BLES

1 When the wa­ter spi­der makes its ab­domen pro­trude above the wa­ter, an air bub­ble is pro­duced around the wa­ter-re­pel­lent hairs.

CRAWLS DOWN A THREAD

2 The bub­ble causes so much lift that it is dif­fi­cult to swim with it. In­stead, the spi­der crawls down a thread that it has spun.

FILLS THE WEB WITH AIR

3 The spi­der spins a web be­tween aquatic plants, fill­ing it with air bub­bles by brush­ing its ab­domen with its legs.

BELL AB­SORBS OXY­GEN

4 The web stretches into a bell. The air is gets dis­solved oxy­gen from the wa­ter, while CO2 from the crea­ture's ex­pi­ra­tion es­capes.

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