• New (Second) Atlas of Breeding Birds in Britain and Ireland: 1988-1991
  All 10-km squares containing land in the UK and Ireland were covered and summary lists detailing which species definitely or probably bred and which possibly bred in each are available. To obtain an estimate of the relative abundance in each 10-km square, at least eight tetrads (2 x 2 km squares) were sampled for 1 or 2 hours in each, data which were incorporated into the 10-km square data. Data on presence of species are available for the sampled tetrads -- that is, whether or not the species was seen in the sample period.

• Atlas of Wintering Birds in Britain and Ireland: 1981/82 - 1983/84
  Covered most of the 10-km squares in the UK and Ireland. For each square, the maximum count recorded in a day, or these counts simplified to one of three levels of relative abundance, for each species during the survey period is available. There are no data available at a finer resolution than 10-km squares.

• First Atlas of Breeding Birds in Britain and Ireland: 1968-1972
  Covered most of the 10-km squares in the UK and Ireland. For each square, summary lists detailing which species definitely bred, which probably bred and which possibly bred during the survey period are available. There are no data available at a finer resolution than 10-km squares.

• Bird Atlas 2007-2011 (but data are not being released until after the fieldwork finishes in 2011)
  This current survey is covering all of the 10-km squares in the UK and Ireland and in both winter and the breeding season. Fieldwork is still in progress and hence data are not being released.

• The Migration Atlas
  See below under Ringing.

• BTO/JNCC/RSPB Breeding Bird Survey (BBS): 1994 onwards
  Monitors the breeding birds of nearly 3,500 randomly selected 1-km squares throughout the UK (earlier years have rather fewer samples). Species lists and counts are available for each of these squares. The results lead to indices of population change
  (see http://www.bto.org/birdtrends/index.htm).
  

• Common Birds Census (CBC): 1961-2000
  Data are available on a site (ca 250 sites per year mostly farmland or woodland) or species basis. For each site, annual summary sheets can be supplied providing a list of the species recorded and numbers of territories for each survey year. Habitat details for each plot can be consulted at the BTO.

• Waterways Breeding Bird Survey (WBBS): 1998 onwards
  Monitors breeding birds along randomly selected 500m sections of waterways. Species lists and counts are available for sampled stretches some of which are the same as WBS stretches.

• Waterways Bird Survey (WBS): 1974-2007
  Data are available in the same format as the Common Birds Census but for the birds along stretches of waterway.

• Nest Record Scheme: 1939 onwards
  This scheme records the nests and their contents of many species of British breeding birds. Data are available on such as clutch size, brood size and breeding success as well as nest sites.

• Wetland Bird Survey (WeBS): 1965 onwards
  Data are available from Core Counts and Low Tide Counts. Core Counts, conducted at both coastal (normally at high tide) and inland wetlands throughout the UK, are made once monthly, normally on pre-selected dates, and concentrate on the winter period, although counts from all months are available for some sites. Around 2,500 sites are covered annually. Low Tide Counts are conducted at most large estuaries in at least one winter every six years, with up to four counts being made through the period November - February. The exposed substrate at low tide is divided into small count areas (sectors) enabling the distribution of feeding and roosting birds to be determined in finer detail.

• Garden BirdWatch (GBW): 1995 onwards
  About 12000 gardens report weekly the numbers of birds of each species visiting. Summary data on numbers are available (see also http://www.bto.org/gbw/results_index.htm)

• Ringing recoveries: 1909 onwards
  This scheme produces data on movements of individual birds. Ringing birds also produces some information on such as moult and biometrics. A summary of the results is in The Migration Atlas.

• BirdTrack: 2004 onwards
  This online scheme allows recording of birdwatching visits to sites and produces information on distribution and movements.

• Heronries Census: 1928 onwards
  

  Over 75% of UK heronries are visited each year and the number of occupied nests is recorded. Nest counts are available for each year that the colony was visited.

• Single Species and Special Surveys: Each of 1-2 seasons' duration
  Data are available for several special surveys, often of single individual species. Most commonly these comprise details of numbers of birds on specific sites (which may be sample squares of the National Grid) and of habitat use. Recent surveys have included:

• Ringed and Little Ringed Plovers in 2007

• Nightjars in 2004

• Breeding Waders in Wet Meadows in 2002.
  

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