The walls of Kathy Holmes' house on Lake Menindee are moving with thousands of wolf spiders as a torrent of water thunders into the lake.

"There are thousands [of spiders]," she said. "They were in the house, on the walls, everywhere."

The spiders started invading her holiday home in the village of Sunset Strip last Tuesday.

"When I was there on Friday, the walls were moving with spiders. I have never seen so many before," said Ms Holmes, who posted a video on YouTube of the spiders that she had cleared out of her house.