Whether it’s Coleridge’s nightingale or Petrarch’s, Ted Hughes’s wren or Shelley’s skylark, Helen Macdonald’s hawk or Max Porter’s crow, literature is measured out in warbles and wingbeats — metaphors that have long since broken free of their originals, birds made not of sinew and bone but ‘ink and sentiment’. Richard Smyth’s A Sweet, Wild Note brings these black and white creatures back into colour, gives them science and geography, acoustics and ecology as well as poetry, bringing all these disciplines to bear on one question: what do we really hear when we hear birds sing?

Birdsong is to ornithology as that...