Nature sometimes works in eerily mysterious ways...
Look at these incredible photos from the Sindh region of Pakistan in December of last year.
Millions of spiders were driven into the trees to escape the floodwaters last year. And since the waters are taking so long to recede, the spiders are staying in their leafy temporary homes.
It's a fascinating, if somewhat unnerving, sight. There are some advantages for local residents; the local mosquito population has dropped off dramatically. In an area hit by disease after the disaster, the decline in mosquitoes means a decline in new cases of malaria.
Now, scientists are wondering whether the spiders will eventually come down, or whether they'll find the treetop hunting too good to abandon.