Blackcaps are really interesting birds. Wintering blackcaps have been recorded in small numbers in Britain for well over a century but since the 1940's and 50's, the numbers of birds overwintering has steadily gone up - 22 birds on average per winter in the 40's and 50's, 380 on average in the 70's, 3000 in the 80's, and in the 00's nearly 3000 from Garden Birdwatch gardens alone.
The birds that overwinter here aren't from the same population that visit in the summer but rather are from Central Europe. The UK overwintering population have been found to have more fledglings than those that migrate further south and are therefore producing more offspring that are genetically programmed to come here.
Damian P
Nice photos Damian. It's quite exciting seeing Blackcaps in the garden in the winter.
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