An exotic spider on the prowl in a Berkshire primary school forced it to close its doors on Tuesday.
It is not yet known what type of spider is in the school
About 350 pupils were told to stay at home after an unusual-looking spider was found in Whitelands Park Primary School in Thatcham.
The eight-legged creature crawled from a set of drums brought from Senegal for a music workshop.
Pest control experts brought in by the education authority to fumigate the school buildings.
The fumigators hoped to flush out the speckled brown spider - said to be as big as an adult's palm.
Keith Ulyatt, spokesman for West Berkshire Council, said: "It was spotted by a classroom assistant yesterday, but as she turned her back to get a container to trap it, the spider ran off.
"The school may smell a bit funny but the chemicals used are completely safe for humans - just not for spiders."
He added the decision to fumigate the school was taken as a precaution.
Experts at London Zoo said it was probably a tropical house spider, which can cause a "nasty reaction" with its bite.
The school will reopen on Wednesday.