Andy Rouse / Bengal Tiger (Panthera tigris) family drinking from pool, Ranthambhore, India

Jami Tarris / Bengal Tiger (Panthera tigris tigris) in waterhole, Ranthambore National Park, India

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

Hermann Brehm / A young female Bengal Tiger (Panthera tigris) walking into water. Banghavgarh National Park, India, April.

Hermann Brehm / A young female Bengal Tiger (Panthera tigris) walking into water. Banghavgarh National Park, India, April.

Hermann Brehm / Young Tigress (Panthera tigris), 22 month, being frightened by a dead leaf. Banghavgarh National Park, India, April.

Andy Rouse / Indo-chinese Tiger (Panthera tigris corbetti) in water. Thailand captive (non-ex)

LYNN M. STONE / Bengal tiger {Panthera tigris tigris} standing amongst bamboo at water's edge, captive

Andy Rouse / Bengal Tiger (Panthera tigris tigris) jumping through water, captive, USA (non-ex)

Andy Rouse / Bengal tiger (Panthera tigris tigris) male walking beside lake, Bandhavgarh NP, Madhya Pradesh, India

LYNN M. STONE / Bengal tiger in water portrait {Panthera tigris tigris} captive

Anup Shah / Young female tigers cool off in waterhole (Panthera tigris) Ranthambhore NP India

Tim Fitzharris / Siberian Tiger (Panthera tigris altaica) walking through tall grass along water's edge

LYNN M. STONE / Sumatran tiger in water, native to SE Asia

Anup Shah / White Tiger head portrait reflected in water {Panthera tigris} captive, India

Sandesh Kadur / Bengal tiger (Panthera tigris) female and cubs swimming in pond. Ranthambore National Park, India.

Andy Rouse / Pair of Bengal tigers (Panthera tigris tigris) courting, male approaching female wallowing in a waterhole, Ranthambore, India.

Marion Vollborn/ BIA / Tiger (Panthera tigris) cub in water, native to Asia

Francois Savigny / Female Bengal tiger drinking (Panthera tigris tigris}, Bandhavgarh, India.

Theo Allofs / Bengal Tiger (Panthera tigris tigris) female cooling off in waterhole, Ranthambore National Park, India

Theo Allofs / Bengal Tiger (Panthera tigris tigris) female at waterhole, Ranthambore National Park, India

Jami Tarris / Bengal Tiger (Panthera tigris tigris) in waterhole, Ranthambore National Park, India

Jami Tarris / Bengal Tiger (Panthera tigris tigris) drinking, Ranthambore National Park, India

Juergen & Christine Sohns / Bengal Tiger (Panthera tigris tigris), white morph in water, Singapore Zoo, Singapore

Juergen & Christine Sohns / Bengal Tiger (Panthera tigris tigris), white morph in water, Singapore Zoo, Singapore

Juergen & Christine Sohns / Bengal Tiger (Panthera tigris tigris), white morph in water, Singapore Zoo, Singapore

Juergen & Christine Sohns / Bengal Tiger (Panthera tigris tigris), white morph in water, Singapore Zoo, Singapore

Juergen & Christine Sohns / Bengal Tiger (Panthera tigris tigris), white morph in water, Singapore Zoo, Singapore

Juergen & Christine Sohns / Bengal Tiger (Panthera tigris tigris), white morph in water, Singapore Zoo, Singapore

John Downer / Bengal Tiger (Panthera tigris tigris) juvenile female drinking while resting in pool, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' March 2007

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) female, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) hiding in freshwater red algae (Batrachospermum moniliforme) Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) female, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) hind oar-like leg detail, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) refilling its air supply under the wing cases, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) female, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) refilling its air supply under the wing cases, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle (Dytiscus marginalis) refilling its air supply under the wing cases, Europe, September, controlled conditions

Jan Hamrsky / Great diving beetle larva (Dytiscus marginalis) feeding on tadpole, Europe, May, controlled conditions

John Downer / Bengal Tiger (Panthera tigris tigris) by pool, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' March 2007

John Downer / Bengal Tiger (Panthera tigris tigris) juvenile male in water keeping cool, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' March 2007

John Downer / Bengal Tiger (Panthera tigris tigris) juvenile female drinking, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' March 2007

John Downer / Bengal Tiger (Panthera tigris tigris) juvenile female, resting in pool to keep cool, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' March 2007

John Downer / Bengal Tiger (Panthera tigris tigris) keeping cool in water, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' March 2007

John Downer / Bengal Tiger (Panthera tigris tigris) juvenile female, resting in pool ti keep cool, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' March 2007

John Downer / Bengal Tiger (Panthera tigris tigris) juvenile female, cooling off in water, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' March 2007

John Downer / Bengal Tiger (Panthera tigris tigris) juvenile female, walking along by water, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle' 2007

Cyril Ruoso / Bengal Tiger (Panthera tigris tigris) white adult wading through water, native to Asia

Cyril Ruoso / Bengal Tiger (Panthera tigris tigris) white adult wading through water, native to Asia

Cyril Ruoso / Bengal Tiger (Panthera tigris tigris), white adult wading through water, native to Asia

Cyril Ruoso / Bengal Tiger (Panthera tigris tigris), white adult wading through water, native to Asia

Axel Gomille / Tiger (Panthera tigris tigris) large cub drinking at water's edge, Bandhavgarh National Park, India

Andy Trowbridge / Bengal Tigers (Panthera tigris tigris) adult female drinking water, her juvenile cub beside her. Bandhavgarh National Park, India, April

Tim Fitzharris / Siberian Tiger (Panthera tigris altaica) sub-adult walking through water, native to Russia

Tim Fitzharris / Siberian Tiger (Panthera tigris altaica) sub-adult walking through water, native to Russia

Suzi Eszterhas / Bengal Tiger (Panthera tigris tigris) eighteen month old cub at waterhole, Bandhavgarh National Park, India

Suzi Eszterhas / Bengal Tiger (Panthera tigris tigris) eighteen month old cubs in waterhole, Bandhavgarh National Park, India

Andrew Parkinson / Bengal Tiger (Panthera tigris) sub-adults, approximately 17-19 months old, playfighting in a forest pool. Endangered. Bandhavgarh National Park, India.

Andrew Parkinson / Bengal Tiger (Panthera tigris) sub-adults, approximately 17-19 months old, playfighting in a forest pool. Endangered. Bandhavgarh National Park, India.

Andrew Parkinson / Bengal Tiger (Panthera tigris) sub-adult, approximately 17-19 months old, cools off by lying in a secluded forest pool. Endangered. Bandhavgarh National Park, India. Non-ex.

Andrew Parkinson / Bengal Tiger (Panthera tigris) sub-adult, approximately 17-19 months old, cools off by lounging in a secluded forest pool. Endangered. Bandhavgarh National Park, India. Non-ex.

Andrew Parkinson / Bengal Tiger (Panthera tigris) sub-adult, approximately 17-19 months old, drinking at a forest pool. Endangered. Bandhavgarh National Park, India. Non-ex.

Andrew Parkinson / Bengal Tiger (Panthera tigris) adult female is spotlit by early morning light and reflected in lake water lake. Endangered. Bandhavgarh National Park, India. Non-ex.

Andrew Parkinson / Bengal Tigers (Panthera tigris), siblings, (female at left, male at right), approximately 17-19 months old, cool off together by sitting in forest pool. Bandhavgarh National Park, India. Non-ex.

Andrew Parkinson / Bengal Tigers (Panthera tigris), sub-adults, approximately 17-19 months old, playfighting in forest pool. Endangered. Bandhavgarh National Park, India. Non-ex

Andrew Parkinson / Bengal Tiger (Panthera tigris) sub-adult, approximately 17-19 months old, cools off by lying in a secluded forest pool. Endangered. Bandhavgarh National Park, India. Non-ex.

Mary McDonald / Bengal tiger (Panthera tigris tigris) female walking along path, reflected in water, Bandhavgarh National Park, Madhya Pradesh, India

Michael W. Richards / Bengal tigress (Panthera tigris tigris) resting in water, Pench National Park, Madhya Pradesh, India

Michael W. Richards / Bengal tigress (Panthera tigris tigris) mother and three large cubs cool off in pool, Pench National Park, Madhya Pradesh, India

Michael W. Richards / Bengal tigress (Panthera tigris tigris) rear view of her resting in pool, Pench National Park, Madhya Pradesh, India

Sandesh Kadur / Bengal tiger (Panthera tigris tigris) feeding on an Indian Rhinoceros carcass half submerged in water, Kaziranga National Park, Assam, India, March

Axel Gomille / Tiger (Panthera tigris) male walking by water. Ranthambhore National Park, India.

Hermann Brehm / Male Tiger (Panthera tigris) resting in water. The lake area of Ranthambore National Park, India, April.

Hermann Brehm / Male Bengal Tiger (Panthera tigris) resting in water. The lake area of Ranthambore National Park, India, April.

Andy Rouse / Indo-chinese Tiger (Panthera tigris corbetti) in lake. Thailand captive (non-ex)

Edwin Giesbers / Sumatran tiger (Panthera tigris sumatrae) standing near water and bamboo vegetation, captive

Edwin Giesbers / Sumatran tiger (Panthera tigris sumatrae) standing near water and bamboo vegetation, captive

David Woodfall / Bengal tiger (Panthera tigris tigris) cooling in water, Bandhavagah NP, Madhya Pradesh, India

Matthew Maran / Bengal tiger {Panthera tigris tigris} sitting, beside water, Bandhavgarh National Park, Madya Pradesh, India

Matthew Maran / Bengal tiger {Panthera tigris tigris} sitting, beside water, Bandhavgarh National Park, Madya Pradesh, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) walking beside water in front of fort, Ranthambore NP, Rajasthan, India (non-ex)

Andy Rouse / Bengal tiger (Panthera tigris tigris) walking beside water, Ranthambore NP, Rajasthan, India (non-ex)

Andy Rouse / Bengal tiger (Panthera tigris tigris) female leaping through lake, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) female leaping through lake, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) walking beside lake, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) male playing with water, Bandhavgarh NP, Madhya Pradesh, India

Andy Rouse / Bengal Tiger (Panthera tigris tigris) jumping into water, captive, USA (non-ex)

Andy Rouse / Bengal tiger (Panthera tigris tigris) female leaping through lake, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) walking by lake, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) female resting in lake to cool off, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) male walking along edge of lake, Bandhavgarh NP, Madhya Pradesh, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) resting in water to cool off, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) male drinking from lake, Bandhavgarh NP, Madhya Pradesh, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) female cooling off in pond, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) entering lake to cool off, Bandhavgarh NP, Madhya Pradesh, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) female cooling off in pool, Ranthambore NP, Rajasthan, India