How do we know what Earth looked like long before humans appeared? Fossils provide many clues. Palaeontological discoveries help scientists reconstruct past environments, trace the evolution of life and learn about creatures that vanished millions of years ago. From dinosaurs to tiny marine organisms, these remnants of the past preserve snapshots of ancient worlds that no longer exist.
Ammonite fossils from the Jurassic Period
Today in History
More Desktop Wallpapers:
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Iguazu Falls seen from Paraná, Brazil
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Common chameleon
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Lesser flamingo flock at sunrise, Lake Magadi, Kenya
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Peach trees in Cieza, Murcia, Spain
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Greater flamingos, Camargue Regional Nature Park, France
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Natural arch carved in an iceberg, Antarctica
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Japanese tree frog in a pink morning glory
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Cypress trees in George L. Smith State Park, Georgia, United States
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Autumn in Naejangsan National Park, South Korea
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Peggys Point Lighthouse, Atlantic Coast, Nova Scotia, Canada
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Anza-Borrego Desert State Park, California, United States
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Cable car and Sugarloaf Mountain, Rio de Janeiro, Brazil
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Vieste, Apulia, Italy
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Bamburgh Castle, Northumberland, England
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Roques de Benet, Catalonia, Spain
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Rice fields at Sapa, Lào Cai, Vietnam
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Koala sleeping in a eucalyptus tree
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Polar bear cubs playing in Svalbard, Norway
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Town of Pienza in Tuscany, Italy
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Pacific sea nettle jellyfish
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Mute swan with chicks in Hesse, Germany
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Arched iceberg, western Antarctic Peninsula, Southern Ocean
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Temple of the Sun, Capitol Reef National Park, Utah, United States
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Polar bear and cubs by Hudson Bay, Manitoba, Canada
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Hay bales in North Yorkshire, England
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Ring-tailed lemur
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Aurora borealis over Spirit Island on Maligne Lake, Canada
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Jotunheimen National Park in Norway
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Isla Cristina, Huelva, Spain
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Grizzly bears, Katmai National Park, Alaska, USA
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