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Bird Atlas Key Statistics

Countdown - 34 tetrads needed in summer to complete the minimum TTV coverage
See a map of where TTV help is most needed here

Headlines - 226 million birds of 579 species (inc escapees and races)
Based on 182262 TTVs, 4307561 Roving Records, and 4504670 BirdTrack records from 17238 online users

Most widespread species on TTVs

This is based on the number of TTVs on which the species was counted.

Season 1st 2nd 3rd
Winter
4th: Blue Tit , 5th: Woodpigeon
Breeding
4th: Woodpigeon , 5th: Robin

Roving Records - thousands of records
The table below summarises the incredible number of Roving Records submitted by observers in each season, and the graph shows the number of Roving Records per survey month since fieldwork began in November 2007.

Season Number of
records		 Number of
species		 Number of
10-km squares
Winter 1978343 445 3847
Breeding 2329218 494 3862

Timed Tetrad Visits - amazing uptake
The table below summarises how many tetrads have been requested by observers in each season.

Season Number of
tetrads signed-up		 Progress towards
minimum requirement		 Click below
for map...
 
Winter		  
50002		 99.8%  
Click for maps
 
Breeding		  
49684		 99.9%

Timed Tetrad Visits - excellent coverage
The table below summarises how many tetrads have been surveyed by observers in each season.

Season Number of
tetrads visited		 Surveyed twice Progress towards
minimum coverage		 Click below
for map...
Winter (all years) 50892 41223 99.9%  
Click for maps
  2007/08 16480 14937
  2008/09 12196 10045
  2009/10 12018 8943
  2010/11 10198 7298
Breeding (all years) 49436 40711 99.9%
  2008 15287 13515
  2009 12447 10214
  2010 12968 10341
  2011 8734 6641

Combined results - Atlas and BirdTrack
The results below bring together Roving Records, Timed Tetrad Visits and information from BirdTrack.

What % of the species have we found in each 10-km square?
For a map click here
Select a region to see more detailed results
(Versions for slow connections here)
 
To view example species maps and results, click on the images below:
Dunnock Woodcock Red Grouse House Sparrow Mistle Thrush Sedge Warbler
Click to view: Dunnock Click to view: Woodcock Click to view: Red Grouse Click to view: House Sparrow Click to view: Mistle Thrush Click to view: Sedge Warbler
Kittiwake Tawny Owl Skylark Fulmar Oystercatcher Willow Warbler
Click to view: Kittiwake Click to view: Tawny Owl Click to view: Skylark Click to view: Fulmar Click to view: Oystercatcher Click to view: Willow Warbler
Maps are provisional, unvalidated and do not include paper records. They are indicative of coverage only.

Validation - turning records to data
The table below summarises the number of records received by season and shows progress on validation. Validation is crucial to ensure the records we use are correct and free from typos or errors.

Season Unchecked Valid ID
query		 Breeding code
query		 Count
query		 Location
query		 % valid % queried
Winter (all years) 361246 6997572 2469 296 585 1814 95.024 0.07
Breeding (all years) 654064 8290056 2513 2301 550 2332 92.608 0.086
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