Children have been left devastated after thugs smashed up a nature reserve they spent four years creating.
The area, which was formerly waste ground at Gilbertstone Primary School, in Yardley, has been targeted twice by the yobs.
After breaking in over the summer holidays they returned after the fence had been fixed to cause more damage.
Pupils are now hoping to raise money to secure their nature reserve.
The vandals stole a camera installed to monitor a badgers’ sett and garden tools after cutting a hole in perimeter fencing. They also scrawled explicit graffiti over a shelter, cut down trees, and left behind smashed bottles and scattered cigarette butts.
Headteacher Ceri Crosskey said: “Over the holidays local youths have broken in and caused quite a bit of damage.
“I can’t believe they’ve been back since the school reopened because there was a big hole in the fence where it had been repaired.
“We’re talking about many thousands of pounds for a proper steel fence to keep them out and also CCTV cameras to deter further break-ins.
“They have really spoilt it for the children.
“We’re going to have to spend lots on securing the site at a massive cost when we’d much prefer to spend the money on the kids’ education.”
Teachers use the reserve to educate pupils about nature and wildlife.
It is also a place where children can go as a reward for hard work in the classroom.
Yardley mum Laura Wickert, whose three children attend Gilbertstone, said the vandalism was a “needless act”.