Some spiders hunt in even the most unexpected environments. For example, the hunting field of the water-spider Dolomedes is the surface of water. This spider is mostly to be found in shallow places such as marshes and ditches.The water-spider, which lacks good eyesight, spends most of its time by the side of the water spinning threads and spreading them over its surroundings. These serve two functions at the same time: they are a kind of warning to other spiders, setting the limits of its own territory, and they also form an escape route in the event of unexpected danger.
The spider's most frequently used hunting method is to put four of its legs on the water while the other four hold on to dry land. While doing this, it employs a most clever technique to avoid sinking. The spider covers those of its legs which will go into the water with a water-proof coating by passing them through its fangs. It then approaches the edge of the water. Pushing its body down with great care, it moves on to the surface of the water. It places its fangs and feelers under the water in such a way as not to disturb the surface. It waits for a living creature to approach, with its eyes looking around it and its legs feeling for vibrations in the water. To feed itself, the spider needs to find prey at least the size of the "Golyan" fish.
When the spider is hunting, it stays motionless until the fish comes within 1.5 centimeters of its jaws. Then it suddenly enters the water, catches the fish in its legs, and bites it with its venomous fangs. Then, in order to stop the fish, which is much bigger than it, from dragging it under the water, it immediately turns upside down. The venom quickly takes effect. It not only kills the prey, but also dissolves the prey's internal organs, turning them into a kind of soup and making them easy to digest. When the prey is dead, the spider drags it on to the shore and feeds. (Science and Technology Gorsel Science and Technology Encyclopedia, p. 494, 495)
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