Tags: Arachnid.
Marpissa muscosa is a species of jumping spider.Females reach about 8–11 mm length males only 6–8 mm. Both sexes are coloured grey to brown. The whole spider has a furry appearance and is flattened in shape. The species builds a kind of nest under the bark of dead trees. Up to 100 of these nests can occur side by side. This spider has a hierarchy: weaker animals will show their inferiority by strutting their front legs and slowly receding from the scene.[citation needed]
