Larinioides sclopetarius, commonly called bridge-spider or gray cross-spider, is a relatively large orb-weaver spider with Holarctic distribution. These spiders are located in Europe and have been observed as south as the Mediterranean Coast and as north as Finland. They are often found on bridges, especially near light and over water. The species tends to live on steel objects and is seldom seen on vegetation. Females reach a body length of 10–14mm, and males 8–9mm. Their orb webs can have diameters of up to 70 cm.
L. sclopetarius is attracted to light. Spiders found near light sources may be in better condition and have greater reproductive success than spiders living in unlit areas. Most of these lighted areas are found in cities or other metropolitan areas. As a result, many urban areas have become saturated with these spiders. As many as 100 of these spiders can be found in a square meter in optimal feeding locations.
L. sclopetarius often hide during the day, and wait for prey in the center of their web at night. In high-density populations, spiders may remain sedentary to protect their territories. Mature females and juvenile spiders will often build webs. However, adult males generally inhabit adult female webs. Males can be found mostly during summer, while females are active until November in Central Europe.
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