I was wondering the same thing. After an extensive google search, here is what I found:
"By gathering together, the harvestmen may be creating an area of desirable temperature and humidity, or making use of the collective repellent power of their smelly defence. It has also been suggested that these aggregations pulsate in order to appear more intimidating to their predators."
www.arkive.org
"By gathering together, the harvestmen may be creating an area of desirable temperature and humidity, or making use of the collective repellent power of their smelly defence. It has also been suggested that these aggregations pulsate in order to appear more intimidating to their predators."
www.arkive.org
