The trust wants to identify where brown hares are most at risk
People in the North East are being asked to report sightings of brown hares to help monitor numbers of the once-widespread animals.
Durham Biodiversity Partnership wants the public in Darlington, Sunderland County Durham and Tyneside to record where and when they see the hares.
Brown hares numbers in the UK fell by about 75% in the past 50 years.
Survey forms are available from the Durham Wildlife Trust Visitor Centres at Low Barns and Rainton Meadows.
The trust carried out a survey between 2002 and 2004, and wants to establish how populations have changed since then.
The results will be used for project work to help conserve and boost brown hare numbers in the region.