Dr. Axel Gebauer / Bacteria - iron and manganese oxidizers and their complementary reducers, in the mud of an empty fish pond, Upper Lusatia Heath and Pond Landscape, Upper Lusatia UNESCO Biosphere Reserve, Germany

Juergen Freund / Paddy melon (Cucumis myriocarpus) growing in red sand dunes of the outback. It is a prostrate or climbing annual herb occurs in southern Africa and is a weed in Australia, South Australia, Australia

Sven Zacek,Sven Zacek / Fresh snow and ice on Baltic Sea coast. The red colour comes from seaweed beneath the ice. Baltic sea coast, Northern Estonia, December 2012.

Wild Wonders of Europe / Widstrand / Farmer sowing seeds by hand, Velebit Mountains Nature Park, Croatia, April 2014.

Tim Laman / Helicopter distributing rat poison, the beginning of a rat eradication program. Grytviken, South Georgia, February 2011.

Julian Hume / Illustration of prehistoric Hawaiian scene. Extinct Kaua'i owl (Grallistrix auceps) scatters a flock of the extinct finch (Chloridops wahi) in pursuit of the more recently extinct Kaua'i O'o (Moho bra...

Julian Hume / Illustration of view of Makauwahi Sinkhole from the southwest side as it might have appeared 3000 years ago,prior to human arrival. On left side,a flock of turtle-jawed moa-nalo (Chelychelynechen quas...