Consi Taylor and her family left their home in London after she spotted the Brazilian wandering spiders, the BBC reported. She said an egg sac appeared to have come in to their home with the bananas, and she first noticed it as a white spot.
"I thought it was mold but when I had a closer look I saw some funny looking spots," she told The Sun. "I had a closer look and was horrified to see they were spiders. They were hatching out on the table, scurrying around on my carpet."
Taylor said an exterminator told her to get out right away, so the family moved to a hotel. Sainsbury's said it would pay the hotel bill and fumigation expenses.
Brazilian wandering spiders, also known as armed spiders and banana spiders, are described as both venomous and aggressive. Most species live in South America with one in Central America.
Stuart Hine, an expert with the Natural History Museum, said English residents should not be too concerned about exotic spiders. False widow spiders, invaders that arrived from the Canaries in the 19th century, have also recently been in the news.
"Unless you actually see something crawl out of your fruit bowl ... chances are it's a common British spider," Hine said.
Alex Renton, a food writer, said that one of the costs of eating pesticide-free food is insects and spiders.