Spi­der Lives Its Whole Life Un­der­wa­ter

The wa­ter spi­der uses its swim­ming ca­pac­ity to cap­ture prey. Its web is used in other ways.

Science Illustrated - - NATURE/ HUNTING -

The wa­ter spi­der is the only spi­der that lives its en­tire life un­der wa­ter, although it needs to breathe just like other spi­ders. And in­stead of catch­ing prey in a web, it uses its ex­cel­lent swim­ming ca­pac­ity to catch up on and kill its prey with poi­son. The web, which its spins be­tween aquatic plants, is used to hide be­hind, when it is hunt­ing.

The wa­ter spi­der’s life would be very trou­ble­some, if it were to move to the sur­face to breathe all the time, but by means of the wa­ter-re­pel­lent hairs cov­er­ing its ab­domen, it can col­lect a layer of air at the sur­face and use it as an oxy­gen bot­tle. More­over, it spins a web that it fills with air bub­bles, mov­ing into it like a div­ing bell.

GERHARD SCHULZ/GETTY IMAGES

The spi­der col­lects air with the hairs on its ab­domen, cre­at­ing a div­ing bell with its web.

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