A major roadworks scheme is being further delayed because of the discovery of an "incredible population" of rare native crayfish.
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The native white-clawed crayfish (left) is threatened
by the American signal crayfish
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White-clawed crayfish are usually found in isolated streams in Britain, but hundreds have been found in a brook near a busy roundabout in Derbyshire.
The Highways Agency said 120 crayfish were initially found near the Little Eaton Island, and then relocated.
A further 100 have now been found during dredging of the brook.
Dredging has not yet finished, meaning more could be found.
Trevor Taylor, from Derbyshire Wildlife Trust, said: "That is an incredible population.
"I was involved in de-siltation works on the Markeaton Brook. You were only talking about handfuls of crayfish, which again was considered to be a decent population.
"Now you are finding hundreds or so, that is a significant population."
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