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.
In Bulgaria, their population is much healthier than Britain and they are an extremely common bird in most parts of the country.
The sexes are identical in appearance, but juveniles can be differentiated by the yellow base to their bills and duller, more diffuse head markings.
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