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.

Latest News

Please note, we are currently reviewing the Mini Mammal Monitoring Scheme while funding is sought to increase volunteer participation and enable analysis of the data. As such we are not accepting volunteers at this time. 

Low Density Live Trapping (Click survey titles to download method PDFs)

Need Longworth or Tube traps for your own surveys? See our Trap Loan Scheme.

Bait Tube Survey  
*UPDATE: Due to Royal Mail changes, all samples must be sent to us at: MMM, The Mammal Society, 3 The Carronades, New Road, Southampton, SO14 0AA

Field Vole Signs Search  


The harvest mouse nest search is now here:


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.