Workers at Aerfin in Gatwick had a shock when they found the 4cm north American black widow spider in a box of aeroplane parts.
Staff member Rob Green carefully coaxed the spider - now nicknamed Nadia - into a plastic tub and called the RSPCA for help.
He said: “It was a bit of a shock finding her in the box. She must’ve been in there for quite a while as the box was packaged up in Arizona back in December and arrived over here in July. She has done very well to survive that long in there.
“I saw her and realised she wasn’t a normal spider from the UK - but it wasn’t until I saw the red spot on her abdomen that alarm bells rang and we looked up what she was.
“We weren’t frightened as I think there have been hardly any deaths from these spider bites - and Nadia was fine. We popped her in the box and called the RSPCA for help.”
Inspector Tony Woodley was called to the depot on Friday and moved the spider to Drusillas Park, in East Sussex for specialist care.