How might they get those silk threads across the river? Biologists have many theories.ĭo they send out a thread to float across the river and entangle in a tree on the other side? Probably not, said Dr.
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"We have no idea how they make these webs," said Dr. The spiders have no obvious way to get their bridge lines across the rivers and streams. Those can reach up to 14 meters (45 feet), stretching across flowing rivers and streams. The silk would have to be strong to hold up for long enough for the spider to catch food.Īn orb spider’s entire web is large, but the bridge line is especially enormous. Web-building spiders tend to use a lot of energy to make their webs, and orb spiders have to make bigger webs than most. The biologists do know two more things-besides size-that make these spiders extraordinary: They build their webs over running water, such as streams and rivers, and the silk they use to make their webs is stronger than that of other spiders. Agnarsson plan to travel there in February to study them extensively. These spiders, all of which are in the genus Caerostris, have not yet been fully studied by scientists and exist only on the island of Madagascar. It continues adding anchor lines until the web looks like a bicycle wheel with spokes. Then it adds a line that will help anchor the web to the ground or another object. The spider makes the bridge line stronger by traveling back and forth along the line, adding more silk to it. First, the spider will spin a silk thread between two objects, like tree branches. These are orb spiders, which make large, round webs that look a lot like the ones people decorate with at Halloween.
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All these species are smaller than the thumb of an adult human being.
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Matjaz Kuntner, believe the webs are made by several closely related spider species. "They are no bigger than some of the spiders you can find in gardens in America or Europe," said Dr. But instead of being the size of the giant spiders in the Harry Potter books, they're more like the spiders in Harry's cupboard under the stairs-a little on the big side, but nothing out of the ordinary. How huge? Big enough to wrap around a VW Beetle, that's how huge. There are spider webs in the highland rain forest of Madagascar that are so huge, they make you wonder if the creatures that built them are big enough to have a starring role in a horror movie.