Residents across the United Kingdom are being urged to keep their windows shut both day and night as the False Widow spider—a venomous species related to the Black Widow—enters its peak mating season.

This alert comes from Dr. Tom Elwood, a top arachnologist, who warns that now is not the time for panic—but for smart preparation. “August is when male spiders become active,” Elwood explained. “They’re searching for a mate and will wander through open windows, vents, or even bathroom drains.”

Why This Spider Is a Serious Concern
The False Widow, though not lethal, can deliver a bite with wasp-like pain, causing burning, swelling, and fever. It’s one of the few spider species in the UK known to regularly bite humans, and experts say their presence in homes is increasing.

The spider’s venom has led to multiple medical reports in recent years. BBC News previously documented cases where victims experienced intense skin irritation and systemic reactions—making it a pest not to ignore.