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Bird Atlas Key Statistics

Headlines - 87.4 million birds of 494 species (inc escapees and races)
Based on 93868 TTVs, 1583339 Roving Records, and 1756286 BirdTrack records from 11541 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: Wren
Breeding
4th: Robin , 5th: Woodpigeon

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 832568 393 3638
Breeding 750771 407 3713

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		  
37259		  
Click for maps
 
Breeding		  
37521

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) 27999 24254  
Click for maps
  2007/08 16449 14856
  2008/09 11550 9398
Breeding (all years) 24172 17443
  2008 15016 13189
  2009 9156 4254

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
 
To view example species maps and results, click on the images below:
Wren Meadow Pipit Sedge Warbler Willow Warbler Little Owl Barn Owl
Click to view: Wren Click to view: Meadow Pipit Click to view: Sedge Warbler Click to view: Willow Warbler Click to view: Little Owl Click to view: Barn Owl
Red Grouse Skylark House Sparrow Tawny Owl Blackbird Oystercatcher
Click to view: Red Grouse Click to view: Skylark Click to view: House Sparrow Click to view: Tawny Owl Click to view: Blackbird Click to view: Oystercatcher
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) 1968015 1669880 668 250 465 1191 45.87 0.071
Breeding (all years) 2194940 1276375 478 2510 131 953 36.726 0.117
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