Martin Gabriel / Firefly crocus (Crocus sieberi) flowers in snow, Bavaria, Germany, March.

Martin Gabriel / Mute swans (Cygnus olor) on water, Bavaria, Germany, February.

Martin Gabriel / Four Griffon Vultures (Gyps fulvus) in flight, silhouetted overhead. Monfrague National Park, Extremadura, Spain, March.

Martin Gabriel / Evaporation ponds for production of salt. La Palma Island, Canary Islands, Spain, February 2010.

Martin Gabriel / Mountain ridges of Caldera de Taburiente silhouetted through clouds. View from Roque de los Muchachos, La Palma Island, Canary Islands, Spain, February.

Martin Gabriel / Canary Pine (Pinus canariensis) forest. La Palma Island, Canary Islands, February.

Martin Gabriel / Hiking trail along ancient aqueduct in Los Tilos National Park. World Biosphere Reserve, La Palma Island, Canary Islands, February.

Martin Gabriel / Prunn Castle in autumn. Altmuehl valley, Bavaria, Germany, October 2010.

Martin Gabriel / Stag Beetle (Lucanus cervus) pair mating. Bavaria, Germany, June.

Martin Gabriel / Woody / Monkey ladder vine (Bauhinia glabra) Palo Verde National Park, Costa Rica

Martin Gabriel / Woody / Monkey ladder vine (Bauhinia glabra) Palo Verde National Park, Costa Rica

Martin Gabriel / Arenal Volcano at sunset, clouds mixing with smoke, Costa Rica, February 2009