A rare orchid has been discovered at a Dorset sewage works.
The early spider orchid was found on a grass roof at Swanage sewage treatment works by ecologists from Wessex Water after staff changed their usual mowing process.
It is unclear how the protected species ended up taking root on the roof, but it is believed a seed may have blown there.
A spokesperson for Dorset Wildlife Trust described it as a "lovely find".
BBC: Early spider orchid found at Dorset's Swanage sewage works
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