Blackcaps have often been claimed as Britain’s champion songsters. Their song is fruity and fluty but mixes in more challenging notes and phrases. They like to sing from cover and are not often seen. The two-syllable song of the cuckoo was once known to everyone in the country, but is now a comparative rarity. Yet in the right places the cuckoos arrive for a six-week frenzy of sound, from late April to the beginning of June.