Mini Mammal Monitoring

Do you want to get involved in small mammal ecology and contribute to our knowledge of their distribution and abundance? Then Mini Mammal Monitoring is for you! This urgently needed, ongoing, multi-species monitoring programme provides long-term reliable year-on-year data on population trends of this keystone group of mammals.

Choose from the following three surveys:

Click on the name of each survey to open a pdf of the Methodology.

Low Density Live Trapping (1st - 30th September) 



Bait Tube Survey (Open all year round)  Buy DNA Kits for the survey here.


*UPDATE: Due to Royal Mail changes, you will no longer send samples to WIT in Ireland for analysis. Instead, we will now courier samples to WIT, so all samples must be sent to us at: MMM, The Mammal Society, 3 The Carronades, New Road, Southampton, SO14 0AA*

Field Vole Signs Search  



Anyone wishing to survey for harvest mice nests, please follow this link to take part:

How to take part:

  1. Send us a post code or grid reference of an area to survey by registering online.
  2. We'll then generate three random sites, called tetrads, for you to choose* from.
  3. Choose which survey(s) you want to do, and read the Health & Safety guidance.
  4. Survey anywhere within your tetrad, using up to 2 transects for each survey method you do
  5. Submit your results online, or send us the paper forms from the handbook if you prefer

*If you have a specific location, e.g. farm or nature reserve, to survey, ask to be allocated that tetrad directly when registering.

Need traps for small mammal trapping surveys?

The Mammal Society loans out Longworth and Tube traps for MMM surveys. See the Trap Loan Scheme.

Explaining tetrads:

Example: SU23N.

A tetrad is a 2x2km square comprising four 1x1km grid squares (in this example SU2436, SU2536, SU2437, SU2537). A tetrad is defined by the grid reference of its South West corner. It is always even numbered. In this example, the defining grid reference for SU23N is SU2436.

There are 25 tetrads in one hectad. A hectad is a 10x10km square (5 tetrads long, by 5 tall). There are ten hectads in one 100x100km square.

The 100km square is defined by two letters, in this example 'SU'. The 10km hectad is defined by the two numbers shown above (in this example 2 and 3). Our hectad, SU23, can be found 20km north, and 30km east from the south-west corner of square SU.

Tetrads within every hectad are labelled A-Z (omitting O) depending on where it sits in the hectad. We locate the tetrad using the 'second' numbers of the grid reference from the SW grid ref, e.g. the 4 and 6. This tetrad is 4km east (known as eastings) and 6km north (northings) of the SW corner of square SU23, therefore N on the grid, as defined by The DINTY system.