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Invisible spider Drapetisca socialis

The Invisible Spider provides us with an intriguing question: does it make a horizontal or a vertical web? It makes a very thin, rather invisible web on the bark of a tree and trees do grow vertically. Very often the only way to notice the web is to look at the legs of the spider: they do not touch the bark at all. The spider is very well coloured and difficult to spot on the barks of beeches or birches, especially when it doesn't move. The body is 3 to 4 millimeters long.