Black widow found in Calgary grocery store grapes

A Calgary family had been eating out of a bag of red seedless grapes for two days before discovering a highly venomous black widow spider hiding inside.

Sean Cardiff noticed something odd when he pulled grapes from the container. "It was like a black spot, and I kind of shook it a little bit, and that little black spot suddenly had legs and started crawling towards my hand," he said. After capturing the spider and ensuring his kids and dog were safe, he called his parents. His mother, Linda Hall, placed it in the freezer and confirmed via the distinctive red hourglass marking on its abdomen that it was indeed a black widow.

The grapes originated from Mexico, making it impossible to identify the exact species, but entomologist Ken Fry from Olds College confirmed the identification from photos. The species matter less than the risk: black widow venom contains alpha-latrotoxin, a neurotoxin that directly targets the central nervous system. Despite the potency, Fry noted that bites are extremely rare because black widows aren't aggressive — they hide in webs and only emerge when disturbed.

Fry attributes the rise in spider discoveries to reduced pesticide use in modern grape production. "As growers and producers adopt more environmentally sensitive means of growing their food, that results in safer food for us, but then it also means that natural enemies like spiders and other predators will move into the crop," he explained. The Canadian Food Inspection Agency says finding live insects in fresh produce is uncommon but doesn't typically pose a food safety risk. Still, the agency recommends washing all fruits and vegetables immediately upon arriving home, and reporting any live insects found to the CFIA.

It's a reminder that even grocery store produce deserves a second look before eating.