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.
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.