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National Dormouse Database (NDD)

The National Dormouse Monitoring programme (NDMP) was established to monitor the state of the UK hazel dormouse population. The National Dormouse Database was set up to record one-off sightings of dormice to provide information on their range and also where populations are likely to exist within their current known range. It is important to keep the information on where populations are likely to be up to date as Natural England will only accept a record of dormouse presence if it is no more than 3 years old.

NDD, NDMP and licence return data information to us with regard the current dormouse range. From this it is known that natural dormouse populations have become extinct in at least 17 counties of Britain.

Recording hazel dormice

A good animal record needs to contain the following information:

  • Who – the name of the person who is making the record
  • What – what the species is (if possible please send a photograph)
  • Where – where was the animal seen (usually a grid reference but could be a postcode)
  • When – when was the animal seen

Hazel dormice are frequently misidentified. All records that are entered into the NDD will need to be verified and photographic evidence is very useful to aid this process. NDD records can be submitted here.


We have been working to save hazel dormice in the UK for over 20 years. Find out about our campaigns and how you can help.

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