BBC: Mild winters and a new diet have helped the long-tailed tit make it into the top 10 birds spotted in UK gardens, says conservation charity the RSPB. More frequent visits meant it reached the highest ranks of the Big Garden Birdwatch poll for the first time. The RSPB said the bird had benefited from a series of mild winters and from adapting to visiting garden feeders. The survey, done in January, recorded almost twice as many long-tailed tits compared with last …