Innocent. Invader. Lover. Thief. Sparrows are everywhere, in many guises. They are cherished pets, subject of elegies by Catullus and John Skelton, listed as 'pretty things' in Sei Shonagon's Pillow Book. They're grimy, urban vermin with shocking manners, so reviled that during the 1950s Mao placed them on the list of 'Four Pests' and ordered the Chinese people to kill them all. In many countries they are appallingly successful non-natives, attacking indigenous birds and ravaging ecosystems. Able to live in the Arctic and the desert, from Beijing to San Francisco, the house sparrow is the most widespread wild bird in the world. In Sparrow, award-winning science and natural history writer Kim Todd explores the complex history, biology and literary tradition of this bird that embodies the word 'common'.