It is the start of spring, not the beginning of autumn. At least that is what the chiffchaff in my Somerset garden seems to think as he belts out his eponymous two-note song.
This tiny olive-green warbler, weighing just 9g – about the same as a £1 coin – should be on his way south by now. But chiffchaffs do not go as far as their cousins: most spend winter in Spain, Portugal or north Africa, rather than making the hazardous journey across the Sahara.
