Adult - Nottinghamshire, England- March 2010

Tree Sparrows are generally common throughout their extensive range (Europe and Asia), but in Britain have suffered a drastic decline with their numbers dropping by about 90% between 1969 and 1994. Their numbers, however, do appear to have stabilised over the last 10 years and recent reports suggest they may even have increased slightly.

Adult - East Yorkshire - May 2009

Adult - East Yorkshire - May 2009

Adult - East Yorkshire - May 2009

Adult feeding chicks - East Yorkshire - May 2009

Juveniles - Trigrad, Bulgaria - June 2007
Juveniles - Trigrad, Bulgaria - June 2007

In Bulgaria, their population is much healthier than Britain and they are an extremely common bird in most parts of the country.

Adult - Bratsigovo, Bulgaria - June 2007
Adult - Bratsigovo, Bulgaria - June 2007

The sexes are identical in appearance, but juveniles can be differentiated by the yellow base to their bills and duller, more diffuse head markings.

Juvenile - Bratsigovo, Bulgaria - June 2007
Juvenile - Bratsigovo, Bulgaria - June 2007
Juvenile - Bratsigovo, Bulgaria - June 2007
Adult - Lancashire, England - March 2003