Common Blackbird
Turdus merula
ABR description
The following is extracted from the Annual Bird Report for the twelve months to June 2017.
Common, breeding resident
An introduced species. Prefers dense vegetation in wet forests, urban parks and gardens, including those of farmhouses. Virtually absent from undisturbed drier woodlands.
General: 1682 records up on 1356 records last year from 96 grids up on 77 last year. Abundance is down 5% on last year but up 17% on the 30YA. Reporting rate is up 3% on last year but down 9% on the 30YA. Max 10/28 Aug JWNR (SmA1), mean 1.7, median 1. Observed throughout the year, but more so in spring (37%) when territorial behaviour draws attention. 11 breeding records up on 4 last year: earliest, cf/18 Aug Hume Wetland GrL16 (HeS1); latest, cf/29 Dec JWNR (SmA1).
GBS: 935 records down from 1087 records last year from 45 sites down from 53 sites last year. Abundance is up 7% on last year but down 56% on the 30YA. The reporting rate is down 3% on last year, and down 44% on the 30YA. 13 breeding records up on 6 last year: earliest nb/4wk Oct Page (AlB1); latest, ny/4wk Dec Page (AlB1).
Abundance
Abundance is the average number of birds of that species per survey. Where the species was observed (presence recorded) but the number of birds seen was not recorded, this is treated as a count of zero.
Abundance by year
This chart shows the abundance of Common Blackbird between 1982 and 2017. 
Abundance by month
This chart shows the monthly abundance of Common Blackbird. The blue lines show the abundance for the twelve months to June 2017 and the bars show the average abundance for the period 1982 to 2017. 
Abundance by season
This chart shows the seasonal abundance of Common Blackbird. The blue lines show the seasonal abundance for the twelve months to June 2017 and the bars show the average seasonal abundance for the period 1982 to 2017. 
Abundance data
| Month | Season | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | Jul | Aug | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Winter | Spring | Summer | Autumn | All | ||
| All years | |||||||||||||||||||
| All | 0.2 | 0.2 | 0.2 | 0.3 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.2 | ||
| Previous years | |||||||||||||||||||
| All previous years | 0.2 | 0.2 | 0.2 | 0.3 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.2 | ||
| Previous 30 years | 0.2 | 0.2 | 0.2 | 0.3 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.2 | ||
| Previous 20 years | 0.2 | 0.2 | 0.1 | 0.3 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | ||
| 10 year groups | |||||||||||||||||||
| [2007,2017) | 0.2 | 0.3 | 0.2 | 0.3 | 0.3 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.2 | ||
| [1997,2007) | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| [1987,1997) | 0.2 | 0.2 | 0.3 | 0.3 | 0.2 | 0.3 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.2 | 0.2 | 0.2 | ||
| 5 year groups | |||||||||||||||||||
| [2012,2017) | 0.2 | 0.3 | 0.2 | 0.3 | 0.3 | 0.3 | 0.2 | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | 0.2 | 0.3 | 0.2 | 0.1 | 0.2 | ||
| [2007,2012) | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | ||
| [2002,2007) | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| [1997,2002) | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| [1992,1997) | 0.1 | 0.2 | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | 0.1 | ||
| [1987,1992) | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 | 0.3 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.2 | 0.3 | ||
| Year | |||||||||||||||||||
| 2017 | 0.2 | 0.2 | 0.2 | 0.3 | 0.4 | 0.3 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.3 | 0.2 | 0.1 | 0.2 | ||
| 2016 | 0.2 | 0.3 | 0.3 | 0.3 | 0.4 | 0.3 | 0.2 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | 0.3 | 0.2 | 0.1 | 0.2 | ||
| 2015 | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.4 | 0.3 | 0.1 | 0.3 | ||
| 2014 | 0.4 | 0.3 | 0.1 | 0.4 | 0.4 | 0.4 | 0.2 | 0.1 | 0.2 | 0.2 | 0.3 | 0.2 | 0.3 | 0.3 | 0.2 | 0.3 | 0.3 | ||
| 2013 | 0.2 | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.2 | ||
| 2012 | 0.1 | 0.3 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 2011 | 0.2 | 0.0 | 0.1 | 0.3 | 0.2 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.0 | 0.1 | ||
| 2010 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | ||
| 2009 | 0.0 | 0.2 | 0.1 | 0.2 | 0.2 | 0.0 | 0.2 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.1 | 0.2 | 0.1 | 0.0 | 0.1 | ||
| 2008 | 0.0 | 0.2 | 0.0 | 0.3 | 0.2 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | ||
| 2007 | 0.3 | 0.1 | 0.0 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 2006 | 0.0 | 0.1 | 0.1 | 0.4 | 0.1 | 0.0 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | ||
| 2005 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 2004 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.2 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 2003 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 2002 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.2 | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 2001 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.0 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 2000 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 1999 | 0.1 | 0.2 | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | ||
| 1998 | 0.0 | 0.0 | 0.1 | 0.3 | 0.0 | 0.1 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.0 | 0.1 | ||
| 1997 | 0.1 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 1996 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 1995 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 1994 | 0.0 | 0.3 | 0.1 | 0.2 | 0.1 | 0.2 | 0.3 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | ||
| 1993 | 0.3 | 0.2 | 0.1 | 0.4 | 0.5 | 0.1 | 0.3 | 0.2 | 0.0 | 0.2 | 0.1 | 0.0 | 0.2 | 0.3 | 0.2 | 0.1 | 0.2 | ||
| 1992 | 0.1 | 0.1 | 0.1 | 0.5 | 0.2 | 0.4 | 0.1 | 0.0 | 0.1 | 0.2 | 0.9 | 0.1 | 0.1 | 0.3 | 0.2 | 0.4 | 0.3 | ||
| 1991 | 0.2 | 0.1 | 0.6 | 0.2 | 0.2 | 0.4 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.3 | 0.2 | 0.3 | 0.2 | 0.2 | 0.2 | ||
| 1990 | 0.2 | 0.2 | 0.2 | 0.1 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.3 | 0.2 | 0.2 | 0.1 | 0.2 | 0.2 | ||
| 1989 | 0.2 | 0.4 | 0.3 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 | 0.3 | 0.2 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.3 | ||
| 1988 | 0.2 | 0.3 | 0.4 | 0.4 | 0.3 | 0.3 | 0.2 | 0.3 | 0.3 | 0.4 | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | ||
| 1987 | 0.2 | 0.4 | 0.3 | 0.5 | 0.3 | 0.5 | 0.4 | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.4 | 0.4 | 0.3 | 0.3 | ||
| 1986 | 0.2 | 0.7 | 0.3 | 0.9 | 0.7 | 1.9 | 0.4 | 0.4 | 0.1 | 0.7 | 0.4 | 0.4 | 0.5 | 0.6 | 0.9 | 0.5 | 0.6 | ||
| 1985 | 0.5 | 0.2 | 0.4 | 0.6 | 0.4 | 0.6 | 0.2 | 0.2 | 0.1 | 0.5 | 0.1 | 0.5 | 0.4 | 0.5 | 0.5 | 0.3 | 0.4 | ||
| 1984 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.3 | 0.1 | 0.5 | 0.2 | 0.1 | 0.0 | 0.1 | 0.3 | 0.2 | ||
| 1983 | 0.0 | 0.0 | 0.0 | 0.2 | 0.4 | 0.2 | 0.0 | 0.0 | 0.0 | - | 0.0 | 0.0 | 0.0 | 0.2 | 0.1 | 0.0 | 0.1 | ||
| 1982 | - | 0.0 | - | 0.0 | 0.0 | 0.0 | - | 0.0 | - | 0.0 | - | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||
Reporting rates
Reporting rate is the proportion of all surveys in which the species was present.
Reporting rate by year
This chart shows the reporting rate of Common Blackbird each year between 1982 and 2017. 
Reporting rate by month
This chart shows the reporting rate by month of Common Blackbird. The blue lines show the reporting rate for the twelve months to June 2017 and the bars show the average reporting rate for the period 1982 to 2017. 
Reporting rate by season
This chart shows the seasonal reporting rate of Common Blackbird. The blue lines show the seasonal reporting rate for the twelve months to June 2017 and the bars show the average seasonal reporting rate for the period 1982 to 2017. 
Reporting rate data
| Month | Season | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | Jul | Aug | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Winter | Spring | Summer | Autumn | All | ||
| All years | |||||||||||||||||||
| All | 13.0 | 15.0 | 13.8 | 16.2 | 18.0 | 16.6 | 15.5 | 9.3 | 7.6 | 10.0 | 12.3 | 8.5 | 11.7 | 15.9 | 14.1 | 9.7 | 13.1 | ||
| Previous years | |||||||||||||||||||
| All previous years | 13.0 | 15.8 | 13.8 | 15.9 | 17.6 | 15.9 | 15.4 | 9.9 | 8.2 | 10.5 | 13.5 | 9.0 | 12.2 | 15.7 | 14.1 | 10.4 | 13.3 | ||
| Previous 30 years | 12.8 | 15.7 | 13.6 | 15.7 | 17.2 | 15.7 | 15.4 | 9.8 | 8.1 | 10.2 | 13.2 | 8.7 | 12.0 | 15.4 | 14.0 | 10.1 | 13.1 | ||
| Previous 20 years | 11.1 | 14.7 | 11.7 | 14.3 | 16.0 | 14.5 | 14.7 | 8.3 | 6.8 | 8.5 | 11.8 | 6.9 | 10.3 | 13.9 | 12.9 | 8.6 | 11.6 | ||
| 10 year groups | |||||||||||||||||||
| [2007,2017) | 11.4 | 15.1 | 12.6 | 14.1 | 18.2 | 16.6 | 15.3 | 7.7 | 6.6 | 8.0 | 11.1 | 6.8 | 10.5 | 14.6 | 13.7 | 8.2 | 12.0 | ||
| [1997,2007) | 10.7 | 13.7 | 9.9 | 14.9 | 11.7 | 10.4 | 12.8 | 9.8 | 7.1 | 9.8 | 13.6 | 7.0 | 9.9 | 12.1 | 11.0 | 9.6 | 10.7 | ||
| [1987,1997) | 18.7 | 18.7 | 23.2 | 23.8 | 21.0 | 22.7 | 19.3 | 17.0 | 15.4 | 18.8 | 18.4 | 18.1 | 18.5 | 22.7 | 19.8 | 17.5 | 19.8 | ||
| 5 year groups | |||||||||||||||||||
| [2012,2017) | 12.4 | 16.8 | 14.9 | 15.8 | 20.9 | 20.5 | 15.0 | 6.7 | 6.9 | 9.2 | 10.1 | 7.5 | 11.8 | 16.8 | 14.2 | 8.5 | 13.1 | ||
| [2007,2012) | 8.8 | 9.3 | 7.5 | 11.2 | 10.6 | 8.3 | 16.3 | 12.1 | 5.7 | 5.1 | 14.0 | 5.5 | 7.1 | 10.1 | 11.9 | 7.3 | 9.3 | ||
| [2002,2007) | 11.2 | 13.1 | 8.8 | 14.9 | 11.7 | 10.3 | 12.9 | 8.3 | 6.0 | 8.5 | 11.4 | 4.9 | 9.1 | 11.8 | 10.6 | 8.1 | 10.0 | ||
| [1997,2002) | 9.8 | 14.4 | 11.3 | 15.0 | 11.6 | 10.6 | 12.8 | 11.3 | 8.6 | 11.4 | 16.2 | 9.7 | 11.1 | 12.5 | 11.4 | 11.4 | 11.7 | ||
| [1992,1997) | 8.3 | 8.3 | 7.1 | 10.9 | 10.4 | 8.8 | 9.5 | 7.2 | 5.0 | 8.4 | 9.2 | 6.3 | 7.6 | 9.7 | 8.6 | 7.5 | 8.4 | ||
| [1987,1992) | 23.4 | 24.3 | 30.9 | 30.9 | 26.1 | 28.8 | 24.6 | 20.8 | 21.6 | 24.7 | 23.1 | 24.8 | 24.2 | 29.2 | 24.8 | 23.2 | 25.6 | ||
| Year | |||||||||||||||||||
| 2017 | 12.4 | 10.7 | 13.4 | 18.1 | 20.9 | 21.1 | 15.7 | 6.3 | 4.3 | 7.3 | 7.3 | 6.3 | 9.2 | 17.5 | 14.2 | 6.2 | 11.9 | ||
| 2016 | 9.5 | 14.7 | 15.1 | 15.4 | 21.3 | 19.1 | 13.2 | 5.2 | 4.8 | 8.6 | 8.3 | 6.0 | 10.3 | 16.8 | 12.0 | 7.1 | 11.6 | ||
| 2015 | 12.8 | 21.7 | 17.8 | 20.1 | 20.3 | 21.7 | 16.0 | 5.7 | 6.1 | 7.3 | 7.6 | 7.8 | 13.0 | 19.5 | 14.6 | 6.9 | 13.8 | ||
| 2014 | 14.5 | 11.8 | 9.9 | 17.0 | 23.3 | 21.6 | 14.0 | 8.0 | 10.9 | 12.0 | 15.4 | 10.2 | 11.6 | 16.2 | 13.7 | 12.3 | 13.7 | ||
| 2013 | 14.5 | 11.8 | 13.5 | 10.0 | 20.0 | 21.6 | 20.3 | 12.9 | 10.7 | 15.6 | 16.3 | 6.5 | 10.6 | 13.7 | 19.1 | 13.6 | 14.9 | ||
| 2012 | 15.4 | 23.6 | 15.4 | 15.0 | 20.2 | 18.9 | 13.7 | 5.4 | 4.8 | 5.0 | 10.2 | 8.1 | 15.0 | 16.4 | 13.9 | 6.0 | 13.4 | ||
| 2011 | 8.1 | 4.8 | 7.8 | 9.9 | 13.9 | 17.3 | 25.7 | 17.8 | 9.1 | 7.5 | 17.5 | 10.5 | 8.8 | 10.0 | 20.6 | 11.1 | 12.9 | ||
| 2010 | 12.5 | 7.0 | 10.5 | 11.8 | 9.1 | 6.9 | 13.5 | 2.4 | 2.4 | 3.0 | 7.8 | 1.5 | 5.1 | 10.8 | 8.6 | 3.6 | 7.6 | ||
| 2009 | 4.3 | 18.8 | 7.1 | 9.8 | 9.4 | 3.2 | 15.3 | 9.2 | 5.1 | 3.7 | 8.4 | 3.2 | 6.8 | 9.0 | 8.7 | 5.3 | 7.7 | ||
| 2008 | 6.2 | 10.4 | 4.5 | 12.4 | 8.7 | 6.8 | 14.3 | 13.0 | 5.9 | 4.7 | 12.6 | 5.1 | 6.8 | 9.7 | 10.3 | 6.5 | 8.5 | ||
| 2007 | 16.5 | 7.4 | 7.9 | 12.4 | 12.8 | 3.7 | 7.5 | 10.4 | 5.1 | 6.0 | 18.7 | 5.2 | 7.7 | 11.2 | 6.3 | 8.3 | 8.6 | ||
| 2006 | 6.6 | 8.7 | 7.5 | 15.3 | 7.7 | 4.5 | 15.2 | 8.9 | 5.3 | 6.5 | 12.3 | 5.0 | 6.2 | 11.5 | 9.6 | 7.1 | 8.8 | ||
| 2005 | 8.8 | 10.3 | 7.4 | 5.5 | 12.4 | 4.4 | 12.8 | 8.7 | 5.2 | 6.6 | 13.9 | 1.9 | 5.5 | 8.1 | 7.6 | 8.5 | 7.5 | ||
| 2004 | 13.1 | 15.8 | 6.7 | 17.4 | 9.3 | 6.0 | 7.9 | 8.1 | 3.1 | 7.7 | 6.8 | 3.7 | 11.1 | 10.9 | 7.1 | 5.6 | 8.9 | ||
| 2003 | 12.0 | 13.7 | 10.2 | 18.1 | 13.3 | 13.1 | 12.6 | 9.3 | 5.8 | 13.4 | 7.8 | 8.1 | 11.0 | 13.6 | 11.8 | 9.1 | 11.5 | ||
| 2002 | 13.7 | 15.3 | 12.4 | 16.7 | 15.0 | 18.6 | 15.7 | 6.6 | 10.5 | 7.7 | 15.3 | 7.5 | 11.7 | 14.8 | 15.1 | 10.4 | 13.3 | ||
| 2001 | 10.2 | 16.3 | 11.3 | 16.0 | 15.9 | 13.0 | 16.0 | 11.9 | 7.8 | 15.1 | 17.9 | 9.9 | 11.8 | 13.8 | 13.6 | 12.4 | 13.0 | ||
| 2000 | 12.7 | 20.3 | 14.9 | 17.6 | 15.7 | 11.4 | 13.2 | 12.9 | 10.2 | 13.3 | 13.6 | 12.4 | 15.1 | 16.1 | 12.4 | 12.0 | 13.8 | ||
| 1999 | 14.7 | 8.2 | 14.9 | 13.8 | 12.3 | 13.8 | 10.9 | 12.1 | 8.6 | 11.9 | 19.3 | 10.7 | 10.4 | 13.8 | 12.4 | 13.2 | 12.6 | ||
| 1998 | 5.4 | 9.4 | 7.3 | 9.8 | 1.8 | 2.8 | 11.8 | 3.8 | 5.4 | 0.0 | 7.4 | 5.3 | 6.7 | 6.1 | 5.7 | 4.4 | 5.8 | ||
| 1997 | 4.6 | 8.6 | 2.7 | 13.2 | 6.0 | 4.8 | 3.9 | 8.8 | 12.5 | 3.7 | 8.9 | 4.2 | 5.5 | 6.6 | 5.7 | 6.7 | 6.2 | ||
| 1996 | 10.4 | 4.3 | 5.3 | 8.8 | 5.6 | 6.1 | 8.7 | 4.7 | 1.0 | 9.4 | 13.8 | 6.9 | 6.9 | 6.7 | 6.6 | 6.7 | 6.7 | ||
| 1995 | 6.5 | 7.0 | 7.8 | 6.1 | 10.9 | 6.9 | 6.2 | 4.8 | 6.1 | 6.5 | 0.0 | 4.3 | 6.0 | 8.0 | 6.1 | 4.7 | 6.3 | ||
| 1994 | 7.8 | 18.2 | 7.4 | 11.6 | 7.4 | 10.9 | 14.7 | 10.3 | 8.0 | 6.9 | 8.8 | 9.0 | 12.0 | 8.6 | 12.2 | 7.7 | 9.7 | ||
| 1993 | 8.2 | 7.7 | 4.8 | 17.3 | 22.7 | 10.9 | 14.3 | 18.8 | 4.9 | 10.0 | 7.8 | 2.9 | 6.1 | 15.3 | 14.2 | 7.3 | 10.3 | ||
| 1992 | 9.2 | 5.6 | 9.4 | 16.0 | 11.1 | 12.7 | 6.9 | 2.4 | 5.6 | 13.6 | 17.1 | 8.3 | 7.8 | 12.4 | 8.0 | 12.1 | 10.4 | ||
| 1991 | 11.0 | 10.6 | 15.1 | 7.8 | 10.3 | 8.1 | 5.4 | 8.0 | 6.3 | 11.9 | 11.5 | 14.0 | 11.4 | 10.8 | 7.2 | 9.8 | 10.1 | ||
| 1990 | 25.8 | 19.5 | 21.5 | 17.3 | 18.7 | 19.4 | 12.5 | 5.6 | 8.0 | 14.3 | 15.1 | 17.1 | 21.4 | 19.1 | 12.6 | 12.2 | 17.3 | ||
| 1989 | 25.5 | 31.0 | 29.7 | 30.0 | 30.8 | 23.9 | 22.3 | 21.1 | 22.2 | 22.6 | 21.7 | 23.2 | 27.0 | 30.1 | 22.5 | 22.2 | 25.7 | ||
| 1988 | 26.3 | 26.5 | 38.8 | 35.5 | 27.7 | 29.2 | 24.1 | 26.9 | 28.7 | 34.2 | 25.3 | 26.1 | 26.3 | 33.2 | 26.7 | 29.3 | 29.0 | ||
| 1987 | 36.4 | 26.7 | 35.2 | 41.8 | 29.0 | 44.1 | 37.4 | 23.3 | 24.4 | 25.9 | 27.9 | 30.4 | 30.4 | 34.7 | 34.4 | 26.1 | 31.8 | ||
| 1986 | 30.8 | 44.7 | 34.0 | 58.3 | 63.8 | 47.1 | 39.1 | 30.6 | 19.4 | 47.1 | 48.3 | 40.0 | 39.4 | 50.7 | 38.7 | 39.6 | 42.8 | ||
| 1985 | 33.3 | 20.0 | 25.0 | 30.2 | 24.6 | 28.3 | 12.5 | 23.5 | 18.2 | 31.6 | 20.0 | 28.6 | 27.3 | 27.2 | 25.9 | 25.0 | 26.7 | ||
| 1984 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 10.3 | 6.1 | 22.2 | 14.7 | 32.3 | 17.6 | 12.2 | 0.0 | 6.8 | 22.8 | 13.6 | ||
| 1983 | 0.0 | 0.0 | 0.0 | 15.4 | 44.4 | 15.4 | 0.0 | 0.0 | 0.0 | - | 0.0 | 0.0 | 0.0 | 22.2 | 6.7 | 0.0 | 8.0 | ||
| 1982 | - | 0.0 | - | 0.0 | 0.0 | 0.0 | - | 0.0 | - | 0.0 | - | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||
Breeding data
Breeding records by month
Number of breeding records by breeding code and month, 2017 and all years| Breeding code | Jul | Aug | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2017 | ||||||||||||
| Breeding (BLA code) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Carrying Food | 0 | 1 | 1 | 1 | 1 | 4 | 0 | 0 | 0 | 0 | 0 | 0 |
| Copulating | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Display | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dependent young | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| Faecal sac | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Inspecting hollow | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Nest building | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Nest with eggs | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Nest with young | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| On/leaving nest | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| All years | ||||||||||||
| Breeding (BLA code) | 0 | 0 | 1 | 5 | 0 | 8 | 1 | 1 | 0 | 0 | 0 | 0 |
| Carrying Food | 0 | 1 | 4 | 13 | 13 | 9 | 4 | 1 | 0 | 0 | 0 | 0 |
| Copulating | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Display | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dependent young | 0 | 0 | 1 | 6 | 12 | 12 | 7 | 1 | 0 | 0 | 1 | 0 |
| Faecal sac | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Inspecting hollow | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Nest building | 0 | 0 | 4 | 15 | 10 | 7 | 3 | 1 | 0 | 0 | 0 | 0 |
| Nest with eggs | 0 | 0 | 4 | 6 | 7 | 4 | 2 | 0 | 0 | 0 | 0 | 0 |
| Nest with young | 0 | 0 | 4 | 7 | 6 | 8 | 2 | 0 | 0 | 0 | 0 | 0 |
| On/leaving nest | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Breeding records by year
Average number of breeding records per period by breeding code| Period | Breeding (BLA code) | Carrying Food | Copulating | Display | Dependent young | Faecal sac | Inspecting hollow | Nest building | Nest with eggs | Nest with young | On/leaving nest |
|---|---|---|---|---|---|---|---|---|---|---|---|
| All years | |||||||||||
| All | 0.4 | 1.2 | 0.0 | 0.0 | 1.1 | 0.0 | 0.0 | 1.1 | 0.6 | 0.8 | 0.1 |
| Previous years | |||||||||||
| All previous years | 0.5 | 1.1 | 0.0 | 0.0 | 1.1 | 0.0 | 0.0 | 1.1 | 0.7 | 0.7 | 0.1 |
| Previous 30 years | 0.5 | 1.2 | 0.0 | 0.0 | 1.3 | 0.0 | 0.0 | 1.3 | 0.7 | 0.9 | 0.1 |
| Previous 20 years | 0.8 | 0.6 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.2 | 0.0 | 0.1 | 0.1 |
| 10 year groups | |||||||||||
| [2007,2017) | 0.1 | 0.6 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.3 | 0.1 | 0.2 | 0.2 |
| [1997,2007) | 1.5 | 0.5 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.2 | 0.0 | 0.1 | 0.0 |
| [1987,1997) | 0.0 | 2.6 | 0.0 | 0.0 | 3.6 | 0.0 | 0.0 | 3.3 | 2.1 | 2.3 | 0.0 |
| 5 year groups | |||||||||||
| [2012,2017) | 0.0 | 1.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.6 | 0.0 | 0.2 | 0.4 |
| [2007,2012) | 0.2 | 0.2 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.2 | 0.2 | 0.0 |
| [2002,2007) | 1.6 | 0.6 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.2 | 0.0 | 0.2 | 0.0 |
| [1997,2002) | 1.4 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 |
| [1992,1997) | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.2 | 0.0 |
| [1987,1992) | 0.0 | 5.0 | 0.0 | 0.0 | 7.2 | 0.0 | 0.0 | 6.4 | 4.2 | 4.4 | 0.0 |
| Year | |||||||||||
| 2017 | 0.0 | 8.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 1.0 | 0.0 | 1.0 | 0.0 |
| 2016 | 0.0 | 2.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 1.0 |
| 2015 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 |
| 2014 | 0.0 | 1.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 |
| 2013 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 |
| 2012 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 |
| 2011 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2010 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2009 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2008 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 | 0.0 |
| 2007 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2006 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 1.0 | 0.0 |
| 2005 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2004 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2003 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2002 | 7.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2001 | 1.0 | 2.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2000 | 6.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1999 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 |
| 1998 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1997 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1996 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 |
| 1995 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1994 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 |
| 1993 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1992 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1991 | 0.0 | 2.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 1990 | 0.0 | 3.0 | 0.0 | 0.0 | 3.0 | 0.0 | 0.0 | 0.0 | 2.0 | 2.0 | 0.0 |
| 1989 | 0.0 | 8.0 | 0.0 | 0.0 | 7.0 | 0.0 | 0.0 | 9.0 | 5.0 | 6.0 | 0.0 |
| 1988 | 0.0 | 5.0 | 0.0 | 0.0 | 9.0 | 0.0 | 0.0 | 5.0 | 3.0 | 7.0 | 0.0 |
| 1987 | 0.0 | 7.0 | 0.0 | 0.0 | 16.0 | 0.0 | 0.0 | 17.0 | 10.0 | 7.0 | 0.0 |
| 1986 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1985 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 | 0.0 | 1.0 |
| 1984 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1983 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1982 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
Distribution map
Distribution - 2017
This map shows the observed distribution of the Common Blackbird for 2017.
The red circles are the grid cells where Common Blackbird have been reported.
The transparency of the red circles indicate how many surveys sheets were submitted for that grid cell; the darker the red the more reliable the data. Of the 315 grid cells with reports, 83 had only one sheet; an example is grid number E3.
The size of the circle represents the reporting rate. The maximum reporting rate for Common Blackbird was 100.0% (eg grid number E3) and the minimum was 0.6% (eg grid number I13). 
Distribution - all years
This map shows the observed distribution of the Common Blackbird for all years.
The red circles are the grid cells where Common Blackbird have been reported.
The transparency of the red circles indicate how many surveys sheets were submitted for that grid cell; the darker the red the more reliable the data. Of the 703 grid cells with reports, 55 had only one sheet; an example is grid number A12.
The size of the circle represents the reporting rate. The maximum reporting rate for Common Blackbird was 55.6% (eg grid number B16) and the minimum was 0.2% (eg grid number Q13). 
Breeding map
Breeding - 2017
This map shows the breeding distribution of the Common Blackbird for 2017.
The red circles are the grid cells where breeding activity for Common Blackbird have been reported.
The size of the circle represents the number of reports. 
Breeding - all years
This map shows the breeding distribution of the Common Blackbird for all years.
The red circles are the grid cells where breeding activity for Common Blackbird have been reported.
The size of the circle represents the number of reports. 