Dave Watts / Wedge-tailed eagle {Aquila audax fleayi} tasmanian sub species, adult portrait, Australia

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) fourteen year old sub-adult male, named Fundi, making submissive facial gesture, Gombe National Park, Tanzania

Andy Rouse / Bengal tiger (Panthera tigris) male, sub-adult aged three years, face portrait. Ranthambhore National Park, India.

Yashpal Rathore / Bengal tiger (Panthera tigris tigris) sub adult tigress resting at dusk. Kanha National Park, Central India. Camera trap image.

Yashpal Rathore / Bengal tiger (Panthera tigris tigris) sub adult tigress resting at dusk. Kanha National Park, Central India. Camera trap image.

Franco Banfi / Striped marlin (Kajikia audax) hunting Sardine (Sardinops sagax) in bait ball. Magdalena Bay, Baja California Sur, Mexico.

Franco Banfi / Striped marlin (Tetrapturus audax) feeding on Sardine (Sardinops sagax). Magdalena Bay, Baja California Sur, Pacific Ocean, Mexico.

Staffan Widstrand / Wild Wonders of China / Red panda or Lesser panda (Ailurus fulgens) in the humid montane mixed forest, Laba He National Nature Reserve, Sichuan, China

Richard Robinson / Snares crested penguin (Eudyptes robustus) on rock washed with sea surf, Snares (Tine Heke) Sub Antarctic Island Group, Southern Ocean, New Zealand. December 2016. Editorial use only.

Tui De Roy / Snares Crested penguin (Eudyptes robustus) group walking up granite slope into Oleander forest, Station Point colony. Snares Island, New Zealand Sub-Antarctic Islands.

Ingo Arndt / Fisheries Protection Vessel (Pharos) arrived at King Edward Point with King penguins on shoreline, South Georgia Heritage Trust Rat Eradication Project, South Georgia, February 2011

Gerry Ellis / Orangutan (Pongo pygmaeus) sub-adult male in trees in haze caused by forest clearing, West Kalimantan, Borneo, Indonesia. October, 2015