A blanket of spider webs, covering plants and trees, surprised locals living in the town of Lezama in Argentina in South America.
Heavy rain brought in millions of spiders.
The invasion was caused by severe flooding in the region, following days of heavy rainfall which forced the spiders to find higher ground to build their webs.
The spiders use the threads to fly on the breeze.
They can travel for kilometres on the wind to find new homes, in what is know as ballooning.