Why do cellar spiders vibrate?
When they are disturbed or when they are under a threat of attack, they start vibrating in their web violently to scare off and discourage their enemy.

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Species of Pholcus
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Scientific Classification
Phylum
Arthropods

Class
Arachnids

Order
Spiders

Family
Cellar spiders

Genus
Pholcus

Species
Long-bodied cellar spider (Pholcus phalangioides)