Domestic pigs roam near Burley, Hampshire, as they take part in pannage, where the animals are allowed to wander in the New Forest to feast on fallen acorns, which are dangerous for the ponies and cattle in large quantities. The Forestry Commission has confirmed that pannage has been extended this year, because of the abundance of acorns.
Photograph: Andrew Matthews/PA

A Bengal tiger cub smuggled into the US and seized at the Mexican border is displayed for the media at the US Fish and Wildlife Service in Torrance, California.
Photograph: Mark Ralston/AFP/Getty Images

Monarch butterflies, Danaus plexippus, from photographer Tim Flach’s latest book Endangered, with text by zoologist Jonathan Baillie.
Photograph: Tim Flash/Abrams & Chronicle Books

African bush elephants head for a pond in Etosha national park, Namibia. Last Convention on International Trade in Endangered Species (Cites) report reveals a rise in large-scale illegal ivory shipments, which could be due to panic selloff by traffickers as countries implement domestic bans.
Photograph: McPhoto/Schaef/Alamy

A red squirrel sitting on a tree trunk covered with autumn mushrooms in Hinterzarten, Germany.
Photograph: Dennis Wegewijs/Alamy

Autumn colours in a forest outside Tbilisi, Georgia.
Photograph: David Mdzinarishvili/Reuters

Bighorn sheep walk in the Valley of Fire state park in Clark County, Nevada.
Photograph: Adam Gray / Barcroft Images