Sussex Harvest Mouse Survey

The Sussex Harvest Mouse Survey aims to give us a greater understanding of this tiny mammal's distribution across Sussex. 

Harvest mouse - Derek Middleton/Sussex Wildlife Trust

The best way to identify whether harvest mice are using a site is to search for their characteristic nests, which are woven from shredded leaves of plants such as grasses, sedges and reed.


Searching for a nest made of grass, in grass - EASY! Harvest mouse nests - Laurie Jackson

Harvest mouse numbers are at their highest in the autumn so the time couldn't be more right to get out searching suitable habitats such as long, tussocky vegetation, reedbeds, and grassy scrub!

Surveyors joining the Sussex Harvest Mouse Survey will be allocated a tetrad (2km x 2km square) to search for harvest mouse nests.

To turn your nest sighting in to a record you just need to make a note of:
  • where you saw it (location and grid reference)
  • when you saw it
  • who you are
  • then pop along to iRecord and wait for your record appear on the Sussex distribution map


Sussex Harvest Mouse Survey - he loved it                           ... so did they! Harvest mouse surveys - Laurie Jackson

But if you want to go that extra mile for harvest mice, you could also record: 
  • the width of the nest
  • its height above ground-level
  • the height of the vegetation in which the nest was located
  • the plant from which the nest had been woven.

What happens next?
  • Let us know you would like to be involved by emailing sussexmammalsurveys[at]
  • Tell us which area of Sussex you are interested in surveying - near home, work or your favourite pub - your choice!
  • We will allocate you a tetrad and send you a map and survey form
  • Go for a walk in your tetrad and search any suitable habitats you find for harvest mouse nests
  • Send us your completed survey form and relax, safe in the knowledge you have played your part in the search for micro mouse!

What are you waiting for? Put your mark on the harvest mouse map!