Best Wildlife Photos of the Week

Freshly hatched mayflies crowd the surface of River Tisza near Tiszacsege, Hungary.
Photograph: Zsolt Czegledi/EPA

Two Vallarta mud turtles in a river in Puerto Vallarta, Jalisco State, Mexico. The recently identified mud turtle is one of the most threatened freshwater turtle species, due to the dramatic urban growth.
Photograph: Ulises Ruiz/AFP/Getty Images

Mandarin ducklings on the Solyonaya Protoka River outside Vladivostok, Russia.
Photograph: Yuri Smityuk/Getty Images