Sylvain Cordier / Monarch butterfly (Danaus plexippus) wintering in Oyamel pine forests (Abies religiosa) Monarch Butterfly Biosphere Reserve / Reserva de Biosfera de la Mariposa Monarca UNESCO World Heritage Site, An...

Suzi Eszterhas / Golden Lion Tamarin (Leontopithecus rosalia), Atlantic Forest, Brazil

Suzi Eszterhas / Golden Lion Tamarin (Leontopithecus rosalia), Atlantic Forest, Brazil

Suzi Eszterhas / Golden Lion Tamarin (Leontopithecus rosalia), Atlantic Forest, Brazil

Shane P. White / Diamond Falls, Soufriere, Saint Lucia, Caribbean

Jeff Foott / Mixed coniferous and deciduous forest after snowfall in autumn, Wells Gray Provincial Park, British Columbia, Canada

Paul Souders/ Worldfoto / Forested hills in mist, Ngong Hills, Kenya

Konrad Wothe / Firefly (Lamprohiza splendidula) light tracks in forest, Bavaria, Germany

Thomas Marent / Splendid Poison Dart Frog (Dendrobates sylvaticus) in rainforest, Timbiqui, Colombia

Thomas Marent / Golden Poison Dart Frog (Phyllobates terribilis) in rainforest, Timbiqui, Colombia

Shane P. White / Forest in autumn near mountains, Mount Fitz Roy, Patagonia, Chile

Andrew Peacock / Minden / Taiga and snow-covered mountains in autumn, Glacier Bay National Park, Alaska