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In Cambridge UK there is this spider: spider close I know not what species but it is common - I think they look good.

But look at this behavior. What are they doing? I thought malting but do spiders do that? Why would they congregate like this? enter image description here

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Those appear to be Daddy Longleg spiders, and they are known for forming spider clusters, which is considered as gregarious behavior. Quoting Wikipedia:

Many species of harvestmen easily tolerate members of their own species, with aggregations of many individuals often found at protected sites near water. These aggregations may number 200 individuals in the Laniatores, and more than 70,000 in certain Eupnoi. Gregarious behavior is likely a strategy against climatic odds, but also against predators, combining the effect of scent secretions, and reducing the probability of any particular individual being eaten.

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    $\begingroup$ Thank you, very interesting. After looking it up it appears to be leiobunum rotundum common in the British Isles. It is very hot at the moment in Cambridge and they're under a window maybe some dew forms at night and yes they all appear to move when I came near them to take the photo as suggested in the wikipedia article. $\endgroup$ – onepound Jul 29 '18 at 8:36

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