environmental consultancy

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Dormice Surveys

Dormice Ecology

Dormice Muscardinus avellanarius are mainly nocturnal and arboreal, and can be found in woodland, hedgerows and scrub. They feed on flowers, fruits and insects, with hazel Corylus avellana being one of their preferred foodplants. Dormice hibernate over the winter months, and during this time they may be found at ground level such as within root balls and beneath moss or fallen leaves.

Protection and Legislation

Dormice are fully protected under The Conservation of Habitats and Species Regulations 2010 and the Wildlife and Countryside Act 1981 (as amended).

It is an offence to;

  • Deliberately capture, injure or kill
  • Deliberately disturb
  • Damage or destroy a breeding site or resting place
  • Possess or advertise/sell/exchange (dead or alive) or any part of

Survey Methods

Wherever development may impact on habitat which could be used by dormice, a dormouse survey must be carried out by a licensed ecologist to determine whether dormice are present. The most common survey technique is the use of nest tubes, often in conjunction with nut or nest searches.

  • Nest tubes: The standard survey practice for dormice on development sites. Nest tubes are placed within suitable habitat on the site and then monitored once per month April-November.
  • Nut search: Examining the site for hazel nuts opened by dormice
  • Nest search: Examining the site for dormice nests

Licensing and Mitigation

Works which will impact upon dormice may require a derogation licence to be obtained from the appropriate statutory body for nature conservation prior to the start of works. A mitigation licence permits operations which would otherwise constitute an offence and will only be approved if it includes a suitable mitigation plan and is completed by a licensed ecologist.

Survey calendar for Dormice

Survey calendar for dormice

Mitigation calendar for Dormice

Mitigation calendar for Dormice

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Telephone +44(0)1275 391 297 Email ecology@abricon.com

2 Chapel Court,
Long Ashton Business Park,
Yanley Lane,
Long Ashton,
BS41 9LB