The eight-legged critters, capable of killing humans, are believed to have arrived from the US by boat
Venomous black widow spiders have occasionally been found in Britain.
The eight-legged critters, capable of killing humans, are believed to have arrived from the US by boat.
Ecologist Graeme Skinner said: “Black widows have come this year and do occasionally manage to survive on shipments from the States.
“It is important to note that they do not survive in our damp climate.
“On two occasions it was just a single one but on another we had six black widows come in together.
“We had one batch come in stuck underneath a camper van from Arizona.”
The black widow spiders – which live across America – are infamous for their gruesome mating rituals.
After mating, the female often eats her unfortunate partner, explaining how the spiders came to be named black widows.
While the female’s venom is extremely potent, and requires medical treatment, it doesn’t usually kill healthy humans.
If bitten by a black widow spider, you can expect pain, cramping, and tremors.
Victims may also experience nausea, fainting, and problems with their breathing.
Mr Skinner said: “Most spiders are very very shy and will avoid any contact with humans and I’m unaware of anyone being bitten by a Black widow in Britain.”