Hardhead
Aythya australis
ABR description
The following is extracted from the Annual Bird Report for the twelve months to June 2017.
Common, breeding visitor
A diving duck often seen in deeper waters.
General: A reduction in abundance from last year reflecting the general pattern of falling numbers since the high of 2012-13 (0.41 cf 3.5 in 2012-13) and their movement in response to the heavy winter and spring rains in eastern Australia. The reporting rate follows the same pattern (4.9 cf 12.5 in 2012-13). Max 870/14 Aug LGeo E GrT09 (LeM1) similar to last year. Reported throughout the year from urban ponds and dams and rural waterbodies. No breeding records.
GBS: 36 records from 2 sites, a reduction from the 76 records last year. Reported from Jerrabomberra GrM16 and Crace Wetlands GrK11. Observed throughout the year but less so during the winter and spring (16% of records). Maximum 35/4wk Mar Jerrabomberra GrM16 (HaL2).
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 Hardhead between 1982 and 2017. 
Abundance by month
This chart shows the monthly abundance of Hardhead. 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 Hardhead. 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 | 1.0 | 1.0 | 1.3 | 1.2 | 1.0 | 0.9 | 1.0 | 0.6 | 0.4 | 0.3 | 0.5 | 0.5 | 0.8 | 1.2 | 0.9 | 0.4 | 0.8 | ||
| Previous years | |||||||||||||||||||
| All previous years | 1.1 | 1.0 | 1.5 | 1.4 | 1.1 | 1.0 | 1.2 | 0.7 | 0.4 | 0.3 | 0.5 | 0.5 | 0.8 | 1.3 | 1.0 | 0.4 | 0.9 | ||
| Previous 30 years | 1.0 | 0.9 | 1.5 | 1.3 | 1.1 | 0.9 | 1.1 | 0.5 | 0.4 | 0.2 | 0.4 | 0.5 | 0.8 | 1.3 | 0.9 | 0.3 | 0.8 | ||
| Previous 20 years | 1.1 | 1.1 | 1.7 | 1.5 | 1.3 | 1.0 | 1.3 | 0.6 | 0.2 | 0.2 | 0.5 | 0.4 | 0.8 | 1.5 | 1.0 | 0.3 | 0.9 | ||
| 10 year groups | |||||||||||||||||||
| [2007,2017) | 1.6 | 1.2 | 2.1 | 1.5 | 1.5 | 1.3 | 1.4 | 0.7 | 0.3 | 0.2 | 0.7 | 0.6 | 1.1 | 1.7 | 1.2 | 0.3 | 1.1 | ||
| [1997,2007) | 0.3 | 0.7 | 0.7 | 1.5 | 0.9 | 0.2 | 0.8 | 0.3 | 0.1 | 0.1 | 0.2 | 0.1 | 0.3 | 1.0 | 0.4 | 0.1 | 0.5 | ||
| [1987,1997) | 0.5 | 0.6 | 0.5 | 0.3 | 0.3 | 0.7 | 0.2 | 0.3 | 1.2 | 0.3 | 0.2 | 0.5 | 0.5 | 0.4 | 0.4 | 0.6 | 0.5 | ||
| 5 year groups | |||||||||||||||||||
| [2012,2017) | 2.1 | 1.4 | 2.8 | 2.0 | 1.9 | 1.6 | 1.6 | 0.8 | 0.4 | 0.3 | 0.8 | 0.9 | 1.4 | 2.2 | 1.4 | 0.5 | 1.4 | ||
| [2007,2012) | 0.5 | 0.7 | 0.7 | 0.6 | 0.4 | 0.7 | 0.8 | 0.2 | 0.0 | 0.0 | 0.2 | 0.1 | 0.3 | 0.6 | 0.6 | 0.1 | 0.4 | ||
| [2002,2007) | 0.4 | 1.1 | 1.0 | 1.2 | 0.4 | 0.2 | 1.4 | 0.5 | 0.1 | 0.2 | 0.2 | 0.1 | 0.4 | 0.9 | 0.6 | 0.2 | 0.6 | ||
| [1997,2002) | 0.0 | 0.3 | 0.4 | 1.8 | 1.5 | 0.3 | 0.2 | 0.2 | 0.1 | 0.1 | 0.0 | 0.2 | 0.2 | 1.2 | 0.2 | 0.1 | 0.5 | ||
| [1992,1997) | 1.6 | 1.6 | 1.3 | 0.6 | 1.0 | 1.8 | 0.6 | 0.6 | 2.1 | 0.4 | 0.4 | 1.1 | 1.4 | 0.9 | 1.0 | 1.0 | 1.1 | ||
| [1987,1992) | 0.0 | 0.1 | 0.0 | 0.1 | 0.0 | 0.3 | 0.1 | 0.2 | 0.7 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.3 | 0.2 | ||
| Year | |||||||||||||||||||
| 2017 | 0.7 | 1.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 0.6 | 0.4 | 0.7 | 0.6 | 0.4 | 0.7 | 0.0 | 0.3 | 0.6 | 0.4 | ||
| 2016 | 1.3 | 1.1 | 2.3 | 1.4 | 2.2 | 1.4 | 0.9 | 0.4 | 0.2 | 0.3 | 0.3 | 0.2 | 0.9 | 1.9 | 0.9 | 0.3 | 1.0 | ||
| 2015 | 0.7 | 0.7 | 1.1 | 1.3 | 2.3 | 1.4 | 0.6 | 0.2 | 0.1 | 0.1 | 0.2 | 0.6 | 0.7 | 1.5 | 0.7 | 0.2 | 0.8 | ||
| 2014 | 0.7 | 1.2 | 1.5 | 1.8 | 1.5 | 1.7 | 3.8 | 2.3 | 1.0 | 0.5 | 0.6 | 0.6 | 0.8 | 1.7 | 2.9 | 0.8 | 1.7 | ||
| 2013 | 9.7 | 4.1 | 10.6 | 6.3 | 2.5 | 2.5 | 2.9 | 1.6 | 0.6 | 0.5 | 0.7 | 0.3 | 4.4 | 6.5 | 2.4 | 0.6 | 3.5 | ||
| 2012 | 0.5 | 0.9 | 0.3 | 0.6 | 0.3 | 1.3 | 0.7 | 0.3 | 0.2 | 0.1 | 5.5 | 3.5 | 1.8 | 0.4 | 0.8 | 1.3 | 1.0 | ||
| 2011 | 1.6 | 0.8 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 0.7 | 0.0 | 0.0 | 0.1 | 0.2 | ||
| 2010 | 0.2 | 0.2 | 0.9 | 0.6 | 0.3 | 2.0 | 1.7 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.7 | 1.6 | 0.0 | 0.6 | ||
| 2009 | 0.1 | 1.9 | 0.4 | 1.0 | 0.7 | 0.1 | 1.1 | 0.7 | 0.1 | 0.0 | 0.2 | 0.0 | 0.4 | 0.8 | 0.6 | 0.1 | 0.5 | ||
| 2008 | 0.1 | 0.5 | 2.0 | 0.5 | 0.6 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.3 | 0.1 | 0.2 | 0.9 | 0.0 | 0.1 | 0.4 | ||
| 2007 | 0.4 | 0.0 | 0.1 | 0.6 | 0.6 | 1.1 | 1.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.1 | 0.2 | 0.5 | 0.9 | 0.1 | 0.5 | ||
| 2006 | 0.2 | 4.1 | 2.0 | 0.9 | 0.0 | 0.0 | 2.3 | 0.1 | 0.0 | 0.0 | 0.1 | 0.1 | 0.9 | 1.0 | 0.9 | 0.0 | 0.7 | ||
| 2005 | 0.7 | 0.2 | 1.1 | 0.1 | 1.2 | 0.0 | 0.9 | 0.7 | 0.3 | 0.0 | 0.2 | 0.0 | 0.2 | 0.8 | 0.4 | 0.2 | 0.4 | ||
| 2004 | 0.4 | 0.7 | 0.3 | 1.3 | 0.7 | 0.6 | 0.4 | 1.4 | 0.1 | 0.0 | 0.3 | 0.2 | 0.4 | 0.7 | 0.7 | 0.1 | 0.5 | ||
| 2003 | 0.7 | 0.6 | 0.3 | 0.3 | 0.2 | 0.1 | 1.3 | 0.2 | 0.1 | 0.4 | 0.5 | 0.1 | 0.4 | 0.3 | 0.4 | 0.3 | 0.3 | ||
| 2002 | 0.1 | 0.5 | 1.6 | 3.3 | 0.0 | 0.1 | 2.0 | 0.5 | 0.1 | 0.5 | 0.2 | 0.0 | 0.2 | 1.7 | 0.7 | 0.3 | 0.8 | ||
| 2001 | 0.0 | 0.1 | 0.0 | 0.3 | 0.0 | 0.1 | 0.3 | 0.7 | 0.2 | 0.3 | 0.0 | 0.2 | 0.1 | 0.1 | 0.3 | 0.2 | 0.2 | ||
| 2000 | 0.0 | 0.4 | 0.1 | 0.3 | 0.4 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 0.1 | 0.0 | 0.1 | ||
| 1999 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.1 | 0.2 | 0.1 | 0.0 | 0.0 | 0.1 | 0.0 | ||
| 1998 | 0.0 | 0.1 | 2.5 | 13.3 | 9.5 | 1.4 | 0.4 | 0.0 | 0.0 | 0.4 | 0.0 | 0.8 | 0.4 | 8.0 | 0.8 | 0.1 | 3.3 | ||
| 1997 | 0.2 | 1.5 | 0.3 | 0.9 | 0.2 | 0.4 | 0.3 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 0.4 | 0.3 | 0.0 | 0.3 | ||
| 1996 | 0.6 | 0.9 | 0.2 | 0.2 | 2.4 | 1.9 | 0.4 | 0.2 | 0.1 | 0.1 | 0.1 | 2.2 | 1.3 | 1.0 | 0.8 | 0.1 | 0.8 | ||
| 1995 | 0.6 | 0.4 | 0.3 | 0.3 | 0.3 | 3.7 | 0.2 | 0.2 | 0.2 | 0.0 | 0.1 | 0.2 | 0.4 | 0.3 | 1.4 | 0.1 | 0.5 | ||
| 1994 | 7.3 | 3.8 | 4.7 | 0.2 | 0.1 | 0.4 | 1.3 | 0.1 | 2.6 | 0.9 | 0.7 | 0.0 | 3.1 | 1.2 | 0.7 | 1.3 | 1.6 | ||
| 1993 | 1.3 | 2.7 | 1.2 | 1.1 | 0.0 | 0.2 | 0.1 | 0.0 | 7.2 | 0.2 | 0.3 | 1.1 | 1.8 | 0.8 | 0.1 | 2.8 | 1.5 | ||
| 1992 | 0.1 | 0.7 | 1.0 | 1.7 | 2.3 | 1.0 | 0.9 | 3.5 | 1.0 | 0.3 | 0.9 | 2.8 | 1.2 | 1.6 | 1.6 | 0.8 | 1.3 | ||
| 1991 | 0.0 | 0.0 | 0.1 | 0.0 | 0.1 | 0.4 | 0.6 | 0.0 | 2.7 | 1.4 | 0.6 | 0.0 | 0.0 | 0.1 | 0.4 | 1.5 | 0.4 | ||
| 1990 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 1.3 | 3.6 | 0.4 | 0.1 | 0.0 | 0.0 | 0.0 | 0.5 | 1.4 | 0.4 | ||
| 1989 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | ||
| 1988 | 0.0 | 0.2 | 0.1 | 0.4 | 0.0 | 0.5 | 0.0 | 0.2 | 0.0 | 0.3 | 0.0 | 0.0 | 0.1 | 0.2 | 0.2 | 0.1 | 0.1 | ||
| 1987 | 0.1 | 1.9 | 0.0 | 0.1 | 0.0 | 0.2 | 0.0 | 0.1 | 0.0 | 0.1 | 0.0 | 0.2 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | ||
| 1986 | 4.3 | 2.8 | 1.9 | 12.2 | 0.7 | 3.9 | 1.3 | 4.9 | 0.5 | 2.0 | 0.9 | 2.6 | 3.1 | 4.2 | 3.6 | 1.3 | 3.1 | ||
| 1985 | 11.7 | 1.7 | 0.8 | 2.6 | 3.6 | 7.8 | 35.0 | 19.8 | 24.2 | 16.2 | 15.5 | 2.9 | 5.5 | 2.4 | 12.8 | 18.2 | 6.8 | ||
| 1984 | 0.0 | 0.3 | 1.0 | 0.4 | 5.5 | 2.2 | 0.0 | 0.4 | 0.0 | 2.0 | 5.1 | 4.8 | 3.4 | 1.5 | 0.5 | 2.5 | 2.0 | ||
| 1983 | 1.5 | 13.7 | 25.6 | 8.1 | 8.0 | 8.7 | 2.5 | 15.3 | 0.5 | - | 2.2 | 0.2 | 6.0 | 11.3 | 9.9 | 1.9 | 8.0 | ||
| 1982 | - | 0.7 | - | 0.0 | 4.8 | 12.5 | - | 7.5 | - | 4.8 | - | 5.4 | 3.4 | 4.2 | 10.3 | 4.8 | 6.1 | ||
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 Hardhead each year between 1982 and 2017. 
Reporting rate by month
This chart shows the reporting rate by month of Hardhead. 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 Hardhead. 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 | 6.7 | 7.1 | 5.4 | 6.3 | 6.2 | 5.3 | 8.3 | 6.5 | 3.9 | 4.4 | 5.7 | 4.5 | 5.9 | 6.0 | 6.7 | 4.6 | 5.8 | ||
| Previous years | |||||||||||||||||||
| All previous years | 6.9 | 7.7 | 6.0 | 7.0 | 6.9 | 5.9 | 8.5 | 6.2 | 3.6 | 3.8 | 5.3 | 4.1 | 6.0 | 6.7 | 6.9 | 4.1 | 6.0 | ||
| Previous 30 years | 6.8 | 7.6 | 5.9 | 7.0 | 6.9 | 5.7 | 8.5 | 6.0 | 3.5 | 3.6 | 5.1 | 4.0 | 5.9 | 6.6 | 6.8 | 3.9 | 5.9 | ||
| Previous 20 years | 7.9 | 9.1 | 6.3 | 7.6 | 8.0 | 6.1 | 9.3 | 6.4 | 3.5 | 3.4 | 5.5 | 4.1 | 6.6 | 7.3 | 7.3 | 4.0 | 6.3 | ||
| 10 year groups | |||||||||||||||||||
| [2007,2017) | 10.3 | 11.3 | 8.1 | 8.2 | 10.4 | 8.1 | 10.8 | 7.8 | 4.2 | 4.1 | 6.8 | 5.3 | 8.4 | 8.7 | 9.1 | 4.8 | 7.8 | ||
| [1997,2007) | 3.7 | 4.3 | 2.8 | 5.8 | 3.3 | 2.2 | 4.1 | 2.6 | 2.1 | 1.8 | 2.5 | 1.5 | 2.9 | 3.9 | 2.8 | 2.1 | 3.0 | ||
| [1987,1997) | 3.2 | 3.2 | 3.9 | 3.3 | 2.9 | 3.7 | 3.9 | 4.1 | 3.4 | 4.4 | 3.5 | 3.3 | 3.2 | 3.3 | 3.9 | 3.8 | 3.5 | ||
| 5 year groups | |||||||||||||||||||
| [2012,2017) | 12.8 | 13.3 | 10.7 | 10.9 | 13.1 | 10.8 | 12.5 | 9.2 | 5.4 | 5.5 | 7.8 | 7.3 | 10.7 | 11.4 | 11.0 | 6.0 | 9.8 | ||
| [2007,2012) | 3.0 | 4.3 | 2.3 | 3.6 | 3.1 | 2.3 | 5.0 | 1.9 | 0.8 | 1.0 | 3.8 | 1.8 | 2.6 | 3.2 | 3.2 | 1.5 | 2.7 | ||
| [2002,2007) | 4.9 | 5.8 | 3.7 | 6.8 | 3.4 | 2.2 | 6.2 | 3.6 | 3.1 | 2.5 | 3.8 | 1.7 | 3.8 | 4.8 | 3.7 | 3.0 | 3.9 | ||
| [1997,2002) | 1.8 | 2.5 | 1.7 | 4.2 | 3.1 | 2.1 | 1.7 | 1.5 | 0.8 | 0.9 | 0.9 | 1.1 | 1.7 | 2.9 | 1.8 | 0.9 | 1.9 | ||
| [1992,1997) | 6.5 | 5.6 | 5.3 | 5.4 | 4.5 | 6.2 | 6.6 | 6.1 | 5.2 | 5.0 | 4.6 | 5.0 | 5.6 | 5.1 | 6.3 | 5.0 | 5.4 | ||
| [1987,1992) | 1.7 | 1.9 | 3.2 | 2.2 | 2.1 | 2.6 | 2.4 | 3.3 | 2.3 | 4.0 | 2.9 | 2.3 | 1.9 | 2.5 | 2.7 | 3.1 | 2.6 | ||
| Year | |||||||||||||||||||
| 2017 | 5.6 | 3.8 | 1.2 | 0.9 | 1.6 | 1.8 | 6.8 | 7.7 | 5.7 | 8.2 | 7.6 | 6.3 | 5.3 | 1.2 | 5.6 | 7.1 | 4.9 | ||
| 2016 | 11.9 | 14.2 | 12.0 | 12.3 | 13.4 | 10.9 | 9.1 | 7.0 | 5.7 | 7.1 | 8.4 | 4.8 | 10.4 | 12.5 | 8.9 | 6.9 | 9.6 | ||
| 2015 | 11.9 | 10.5 | 12.6 | 13.1 | 11.5 | 9.9 | 8.7 | 5.5 | 3.6 | 2.7 | 5.1 | 6.6 | 9.1 | 12.5 | 8.1 | 3.7 | 8.4 | ||
| 2014 | 14.5 | 13.4 | 10.4 | 10.5 | 9.3 | 11.0 | 18.1 | 17.9 | 9.3 | 6.6 | 8.1 | 10.2 | 12.1 | 10.2 | 16.6 | 8.1 | 11.9 | ||
| 2013 | 18.6 | 19.0 | 10.8 | 9.7 | 19.7 | 12.4 | 22.8 | 11.1 | 5.0 | 6.7 | 10.0 | 8.3 | 14.8 | 12.7 | 15.9 | 6.6 | 12.5 | ||
| 2012 | 10.3 | 10.2 | 4.4 | 6.7 | 10.9 | 9.7 | 8.8 | 12.7 | 3.3 | 2.8 | 10.2 | 9.9 | 10.1 | 7.1 | 9.8 | 4.5 | 7.9 | ||
| 2011 | 5.7 | 3.2 | 1.6 | 1.6 | 0.6 | 3.0 | 2.4 | 0.9 | 0.3 | 0.6 | 1.8 | 3.2 | 3.7 | 1.4 | 2.2 | 0.9 | 1.9 | ||
| 2010 | 1.0 | 3.5 | 3.4 | 4.4 | 2.9 | 4.0 | 6.3 | 2.4 | 0.0 | 0.4 | 1.0 | 1.1 | 1.7 | 3.8 | 4.6 | 0.3 | 2.8 | ||
| 2009 | 2.2 | 9.4 | 3.0 | 4.4 | 2.7 | 1.1 | 7.3 | 3.3 | 3.3 | 1.2 | 6.9 | 1.4 | 3.3 | 3.7 | 3.7 | 3.2 | 3.5 | ||
| 2008 | 2.8 | 2.6 | 1.5 | 3.6 | 5.4 | 0.5 | 4.0 | 0.0 | 0.0 | 0.3 | 5.4 | 2.8 | 2.7 | 3.3 | 1.3 | 1.1 | 2.3 | ||
| 2007 | 3.3 | 3.7 | 2.1 | 4.1 | 4.7 | 2.3 | 6.7 | 3.5 | 0.9 | 2.6 | 5.7 | 0.3 | 1.6 | 3.6 | 4.2 | 2.5 | 3.1 | ||
| 2006 | 5.9 | 4.9 | 4.8 | 5.1 | 2.4 | 1.7 | 8.4 | 3.0 | 3.2 | 2.7 | 2.9 | 1.1 | 3.3 | 4.5 | 4.5 | 3.0 | 3.8 | ||
| 2005 | 2.9 | 2.8 | 2.6 | 2.2 | 4.1 | 0.8 | 1.4 | 3.3 | 5.2 | 1.1 | 5.5 | 1.1 | 2.0 | 2.9 | 1.4 | 4.1 | 2.7 | ||
| 2004 | 5.2 | 9.9 | 3.4 | 5.8 | 3.5 | 4.6 | 4.8 | 6.1 | 1.0 | 1.1 | 4.9 | 2.5 | 5.6 | 4.2 | 5.0 | 1.9 | 4.2 | ||
| 2003 | 8.5 | 5.0 | 4.7 | 10.4 | 5.0 | 0.8 | 5.9 | 3.8 | 4.0 | 2.3 | 3.1 | 2.5 | 5.0 | 6.5 | 3.1 | 3.2 | 4.5 | ||
| 2002 | 2.9 | 5.1 | 3.0 | 11.2 | 2.0 | 2.9 | 9.4 | 2.6 | 1.4 | 5.4 | 1.2 | 2.2 | 3.1 | 5.7 | 4.5 | 2.7 | 4.2 | ||
| 2001 | 0.0 | 1.2 | 1.2 | 5.0 | 2.8 | 0.7 | 1.5 | 3.1 | 1.5 | 2.0 | 0.6 | 1.5 | 0.8 | 2.8 | 1.6 | 1.4 | 1.7 | ||
| 2000 | 0.8 | 3.9 | 1.9 | 4.0 | 3.7 | 2.3 | 1.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.5 | 3.2 | 1.3 | 0.0 | 1.5 | ||
| 1999 | 2.9 | 0.0 | 0.0 | 0.0 | 0.6 | 0.6 | 0.7 | 0.0 | 0.5 | 1.0 | 1.1 | 1.4 | 1.2 | 0.2 | 0.5 | 0.9 | 0.7 | ||
| 1998 | 0.0 | 1.9 | 2.4 | 4.3 | 5.3 | 7.5 | 2.9 | 0.0 | 0.0 | 2.6 | 7.4 | 2.7 | 1.8 | 4.0 | 4.4 | 1.9 | 3.3 | ||
| 1997 | 8.0 | 6.9 | 4.5 | 10.5 | 3.4 | 1.9 | 5.9 | 7.0 | 2.5 | 0.0 | 0.0 | 0.0 | 5.1 | 5.6 | 4.2 | 0.5 | 4.1 | ||
| 1996 | 7.5 | 5.3 | 5.3 | 5.3 | 8.3 | 4.0 | 6.8 | 5.9 | 2.9 | 6.2 | 3.4 | 6.9 | 6.5 | 6.4 | 5.6 | 4.0 | 5.7 | ||
| 1995 | 5.4 | 5.4 | 1.9 | 4.3 | 4.5 | 8.0 | 7.1 | 4.8 | 4.1 | 1.6 | 2.6 | 3.2 | 4.7 | 3.7 | 6.8 | 2.7 | 4.4 | ||
| 1994 | 5.9 | 5.2 | 7.4 | 3.5 | 1.5 | 6.5 | 7.4 | 5.2 | 8.0 | 6.9 | 2.5 | 1.1 | 3.7 | 3.4 | 6.4 | 6.0 | 4.8 | ||
| 1993 | 10.2 | 6.4 | 4.8 | 9.3 | 1.5 | 6.5 | 4.1 | 0.0 | 3.7 | 5.0 | 3.9 | 5.8 | 7.1 | 5.4 | 3.9 | 4.1 | 5.2 | ||
| 1992 | 4.6 | 5.6 | 8.2 | 6.4 | 6.9 | 6.3 | 6.9 | 14.6 | 8.5 | 6.8 | 10.5 | 10.0 | 6.7 | 7.2 | 8.6 | 8.7 | 7.8 | ||
| 1991 | 1.6 | 1.1 | 3.5 | 1.0 | 3.1 | 4.1 | 12.5 | 4.0 | 4.8 | 11.9 | 11.5 | 4.0 | 1.8 | 2.4 | 6.7 | 9.3 | 4.5 | ||
| 1990 | 1.3 | 1.1 | 2.2 | 2.0 | 2.8 | 5.6 | 5.6 | 11.3 | 5.7 | 7.1 | 2.7 | 1.3 | 1.2 | 2.3 | 7.4 | 5.3 | 3.5 | ||
| 1989 | 1.0 | 0.9 | 2.2 | 1.5 | 2.0 | 2.6 | 0.0 | 2.1 | 1.7 | 3.6 | 2.0 | 1.2 | 1.0 | 1.9 | 1.6 | 2.5 | 1.7 | ||
| 1988 | 2.2 | 3.0 | 6.2 | 3.5 | 2.4 | 2.1 | 1.0 | 2.9 | 1.0 | 4.3 | 2.5 | 2.4 | 2.5 | 3.7 | 1.9 | 2.6 | 2.7 | ||
| 1987 | 9.1 | 13.3 | 2.4 | 2.0 | 1.5 | 1.4 | 2.1 | 2.1 | 1.9 | 1.2 | 1.7 | 2.9 | 3.9 | 1.9 | 1.9 | 1.6 | 2.0 | ||
| 1986 | 7.7 | 7.9 | 11.3 | 5.6 | 8.5 | 11.8 | 13.0 | 13.9 | 9.7 | 5.9 | 6.9 | 14.3 | 10.1 | 8.8 | 12.9 | 7.2 | 9.6 | ||
| 1985 | 13.3 | 13.3 | 5.8 | 4.7 | 5.3 | 8.3 | 62.5 | 29.4 | 27.3 | 42.1 | 30.0 | 17.9 | 14.8 | 5.1 | 17.6 | 35.0 | 12.7 | ||
| 1984 | 0.0 | 10.0 | 20.0 | 16.7 | 50.0 | 33.3 | 0.0 | 6.1 | 3.7 | 11.8 | 16.1 | 5.9 | 6.1 | 23.8 | 8.1 | 10.9 | 10.2 | ||
| 1983 | 33.3 | 33.3 | 40.0 | 30.8 | 22.2 | 23.1 | 16.7 | 36.4 | 50.0 | - | 25.0 | 9.1 | 24.1 | 29.6 | 26.7 | 28.6 | 27.0 | ||
| 1982 | - | 9.1 | - | 0.0 | 12.5 | 28.6 | - | 36.4 | - | 38.5 | - | 28.6 | 20.0 | 11.1 | 32.0 | 38.5 | 26.4 | ||
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 | 0 | 0 | 0 | 0 | 0 | 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 | 0 | 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 | 0 | 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 | 0 | 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 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Carrying Food | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Copulating | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Display | 0 | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dependent young | 0 | 0 | 0 | 3 | 0 | 4 | 0 | 0 | 0 | 2 | 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 | 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 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| On/leaving nest | 0 | 0 | 0 | 0 | 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 | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Previous years | |||||||||||
| All previous years | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Previous 30 years | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Previous 20 years | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 10 year groups | |||||||||||
| [2007,2017) | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| [1997,2007) | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| [1987,1997) | 0.0 | 0.0 | 0.0 | 0.2 | 0.4 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 |
| 5 year groups | |||||||||||
| [2012,2017) | 0.0 | 0.0 | 0.0 | 0.2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| [2007,2012) | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| [2002,2007) | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| [1997,2002) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| [1992,1997) | 0.0 | 0.0 | 0.0 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| [1987,1992) | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 |
| Year | |||||||||||
| 2017 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2016 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2015 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2014 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2013 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2012 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 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 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2009 | 0.0 | 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 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2007 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2006 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2005 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2004 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2003 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2002 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2001 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 2000 | 0.0 | 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 | 0.0 | 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 | 0.0 | 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 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1993 | 0.0 | 0.0 | 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 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1991 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1990 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1989 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1988 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 |
| 1987 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1984 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 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 Hardhead for 2017.
The red circles are the grid cells where Hardhead 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 R17.
The size of the circle represents the reporting rate. The maximum reporting rate for Hardhead was 100.0% (eg grid number R17) and the minimum was 0.1% (eg grid number K13). 
Distribution - all years
This map shows the observed distribution of the Hardhead for all years.
The red circles are the grid cells where Hardhead 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 Hardhead was 75.0% (eg grid number S11) and the minimum was 0.0% (eg grid number K15). 
Breeding map
Breeding - 2017
This map shows the breeding distribution of the Hardhead for 2017.
The red circles are the grid cells where breeding activity for Hardhead have been reported.
The size of the circle represents the number of reports. 
Breeding - all years
This map shows the breeding distribution of the Hardhead for all years.
The red circles are the grid cells where breeding activity for Hardhead have been reported.
The size of the circle represents the number of reports. 