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  • Atlases

    Both Atlases have now been published:

    N Wales Atlas cover UK Atlas 2007-11


    Have a look at the results of all the BTO national Atlases: Mapstore

    To organise the fieldwork for these atlases the following geographical arrangements were in place:

    For the western squares the contact was Mel ab Owain - for the eastern squares the contact was Anne Brenchley (these are not the official BTO squares but will serve for first contacts).

    Mel ab Owain Anne Brenchley
    10 km squares 10 km squares
      SH88 SH98 SJ08 SJ18      
    SH77 SH87 SH97 SJ07 SJ17      
    SH76 SH86 SH96 SJ06 SJ16 SJ26 SJ36  
    SH75 SH85 SH95 SJ05 SJ15 SJ25 SJ35  
      SH84   SJ04 SJ14 SJ24 SJ34 SJ44
          SJ03 SJ13 SJ23    

    Within each 10 km square there are 25 tetrads as shown below:

    E J P U Z
    D I N T Y
    C H M S X
    B G L R W
    A F K Q V

    The map, below, shows the tetrad SJ26N, which means that its western boundary is the easting 24 and the bottom boundary is northng 66 within the 100 km square SJ, so the tetrad includes the 1 km squares: SJ2466, SJ2467, SJ2566 and SJ2567.

    Map of SJ26N

    The CBRG welcomes receiving breeding season records with breeding codes, as used in the Atlas fieldwork, and listed below:

    Possible breeding

    01 H - Observed in suitable Habitat

    02 S - Singing male

    Probable breeding

    03 P- Pair in suitable nesting habitat

    04 T - Permanent Territory (defended for at least one week)

    05 D - Courtship and Display

    06 N - Visiting a probable Nest site

    07 A - Agitated behaviour

    08 I - Brood patch of Incubating bird (from bird in the hand)

    09 B - Nest Building or excavating a nest hole

    Confirmed breeding

    10 DD - Distraction Display or injury feigning

    11 UN - Used Nest or eggshells found from this season

    12 FL- Recently FLedged young or downy young

    13 ON - Adults entering or leaving nest site in circumstances indicating Occupied Nest

    14 FF- Adult carrying Faecal sac or Food for young

    15 NE - Nest containing Eggs

    16 NY - Nest with Young seen or heard


    Please enter these codes in the 'Activity' column in the spreadsheet or the relevant extra details form in BirdTrack.


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    Last updated: 3 February 2019