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

Karine Aigner / Bengal tiger (Panthera tigris tigris) head, close up. Ranthambore National Park, Rajasthan, India.

Karine Aigner / Bengal tiger (Panthera tigris tigris) licking paw. Ranthambore National Park, Rajasthan, India.

Paul Williams / Sumatran tiger (Panthera tigris sumatrae) close up portrait, captive.

Nayan Khanolkar / Bengal tiger (Panthera tigris tigris) in forest clearing. Camera trap image. Pench National Park, Madhya Pradesh, India. January 2018.

Andy Rouse / Bengal tiger (Panthera tigris) male 'T91 - Cowboy' at base of tree, Ranthambhore, India, Endangered species.

Jan Hamrsky / Diving beetle (Colymbetes fuscus) close up head portrait. Europe, June. Controlled conditions.

Andy Rouse / Bengal tiger (Panthera tigris tigris) portrait, whilst stalking, Bandhavgarh, India.

Espen Bergersen / Bengal tiger (Panthera tigris tigris) portrait, Bandhavgarh, India.

Espen Bergersen / Bengal tiger (Panthera tigris) baring teeth, Bandhavgarh, India.

Ole Jorgen Liodden / Bengal tiger (Panthera tigris tigris) close up of eye, hidden in vegetation, Bandhavgarh, India.

Andy Rouse / Bengal tiger (Panthera tigris tigris) 11 month cub in winter forest, Ranthambhore National Park, India.