Jack Dykinga / Hairy bird's foot morning glory (Ipomoea leptotoma) flower over Prickly pair (Opuntia sp) Catalina State Park, near Tucson, Arizona, USA, August.

Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) male baby 'Thor' aged 8-9 months hanging from his mother. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia. July 2010. Rehabi...

Doug Allan / Climbers on summit ridge at 6,000m, Mount Illampu, Bolivia, March 2005. Freeze Frame book plate page 137.

Matthew Maran / Delacour's langur (Trachypithecus delacouri) climbing a tree and exiting frame, Ninh Binh, Vietnam, 2018.

Terry Whittaker / Red squirrel (Sciurus vulgaris) feeding in a Scots pine tree (Pinus sylvestris) before leaving frame, Black Isle, Ross and Cromarty, Scotland, April.

Eric Baccega / Giant panda (Ailuropoda melanoleuca) male, Yuan Zi, lying on climbing frame eating bamboo, captive, Zoo Parc de Beauval, France, Endangered

Roland Seitre / Hoffman's Two Toed Sloth (Choloepus hoffmanni) on climbing frame, observed by volunteers. Aviarios del Caribe Sloth Refuge, Costa Rica, 2008.

Tom Struhsaker / Adult female Uganda Red Colobus Monkey (Procolobus rufomitratus tephrosceles) on a trunk she is stripping of bark to feed on. Kanyawara, Kibale National Park, Uganda.

Tom Struhsaker / Uganda Red Colobus Monkey (Procolobus rufomitratus tephrosceles) medium sized juvenile eating bark of bottle brush (Callistemon citrinus). Kanyawara, Kibale National Park, Uganda.

Tom Struhsaker / Uganda Red Colobus Monkey (Procolobus rufomitratus tephrosceles) resting between trees. Kanyawara, Kibale National Park, Uganda.

Tom Struhsaker / Uganda Red Colobus Monkey (Procolobus rufomitratus tephrosceles) adult / subadult female. Kanyawara, Kibale National Park, Uganda.

Tom Struhsaker / Sanje Mangabey Monkey (Cercocebus galeritus sanjei) juvenile feeding in canopy. Mizimu area, Sonjo Valley, Udzungwa Mountains National Park, Tanzania. Endangered species