Best Wildlife Photos of the Week

A sparrow sits in a puddle as cherry blossom is reflected in the water in Washington.
Photograph: Jacquelyn Martin/AP

Brown hares play on arable farmland near the Borders town of Kelso.
Photograph: Chris Strickland/Alamy

A wild yak in the Altun mountains reserve in north-west China’s Xinjiang region.
Photograph: Jiang Wenyao/Xinhua/Barcroft Images