Independent: One of Britain’s most charming small birds, once known as the bumbarrel, has entered the garden birdwatch top 10 for the first time. The tiny long-tailed tit is so small — the tail is longer than the body — that it is very vulnerable to cold weather. In harsh periods as many as 90 per cent may die. However, the recent run of mild winters (with the exception of 2009) has produced a population boom, and in this year’s Big Garden Birdwatch, run by the Royal Society for the Protection …