Not all spiders weave the canvas: half of them do not and some make a single silk thread, which they use to find their way or to catch their prey. Among those that do not weave the canvas there are the spiders of the family of the salticidae, also called jumpers, who capture the prey by chasing it and jumping on it. More than 5, 000 species are part of it. They are less than two centimeters long, have bright colors (for which they are also called harlequin spiders) and their name derives also from the fact that, at the time of mating, to conquer the female they perform real dances that can last even a 'now: they raise the front legs, they rotate on themselves, they make the body swing from one side to the other, they gesticulate with the legs.