Solvin Zankl / A Costa Rican researcher monitors the temperature in the developing sea turtle nests at Ostional beach, Costa Rica, November 2009. ^^^ Sea turtles have, like many other reptiles, temperature-dependent...

Dr. Axel Gebauer / Red panda (Ailurus fulgens) fieldwork and survey work in Pangolakha Wildlife Sanctuary, Sikkim, India. Persons from left: Basant Kumar Sharma (WWF), Pawan Subba (Beat Off. Forest Dept.), Chenga Buthi...

Solvin Zankl / A Costa Rican researcher monitors the temperature in the developing Olive Ridley sea turtle nests at Ostional beach, Costa Rica, November 2009. ^^^ Sea turtles have, like many other reptiles, temperat...

Nick Upton / Nigel Jarrett, Aviculture manager, "candling" a mallard egg (Anas platyrynchos) taken from an egg-turning incubator full of duck eggs, WWT Slimbridge, UK, May 2009.

Nick Upton / Mallard (Anas platyrhynchos) egg from captive rearing incubator being "candled" to check its development. WWT Slimbridge, Gloucestershire, UK, May 2009.

Luiz Claudio Marigo / Late Dr. William D. Hamilton, one of the greatest evolution biologists of the 20th century, at work in the field, at Mamiraua¡ Sustainable Development Reserve, Amazonas State, Brazil.

Luiz Claudio Marigo / Herpetologists Ronis and Barbara da Silveira inspect nest of Black caiman {Melanosuchus niger) to count eggs, Varzea flooded forest of Mamiraua Sustainable Development reserve, Amazonas, Brazil. 1995

Solvin Zankl / Fog harvesting nets at the Gobabeb training and research centre, Namib Desert, Namibia. Fog in the Namib Desert is a regular and predictable event occurring over 200 days per year. The product of the...