Best Wildlife Photos of the Week

A bighorn ewe in Challis, Idaho.
Photograph: Northwest Wild Images/Alamy

A newly identified population of sperm whales in the Indian Ocean is attracting the attention of scientists, conservationists – and now tourists too.
Photograph: Andrew Sutton

A bluethroat sits on a stalk in the Wagbachniederung nature reserve in Waghäusel, near Karlsruhe in Germany.
Photograph: Ronald Wittek/EPA