Tim Fitzharris / Clouds at sunset, Black Canyon of the Gunnison National Park, Colorado

Juan Carlos Munoz / Aerial view of cliffs at the edge of Lake Powell, near Page, Arizona, on the Utah border, USA, February 2015. Lake Powell is a reservoir on the Colorado River, and is the second largest man made lake...

Juan Carlos Munoz / Aerial view of Lake Powell, near Page, Arizona and the Utah border, USA, February 2015. Lake Powell is a reservoir on the Colorado River, and is the second largest man made lake in the USA.

Juan Carlos Munoz / Aerial view of Lake Powell, near Page, Arizona and the Utah border, USA, February 2015. Lake Powell is a reservoir on the Colorado River, and is the second largest man made lake in the USA.

Christian Ziegler / Greater Bulldog Bat (Noctilio leporinus) sequence catching a fish from Lake Gatun, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

David Noton / Flamingos on Laguna / Lake Colorada at dawn, Eduardo Avaroa Andean Fauna National Reserve, Bolivia, December 2009

Daniel Heuclin / Andean flamingos / Pariwana (Phoenicopterus andinus) taking off / flying over Lake Colorada, with reflections. National Andean Fauna Reserve, Eduardo Abaroa, Bolivia, South America

Charlie Summers / Meteor going past comet 46P / Wirtanen and the Pleiades seen in early morning hours, Echo Lake, Colorado, USA. September 17 2018.

Charlie Summers / Eared grebes (Podiceps nigricollis) courtship dance on lake, Arapaho National Wildlife Refuge, North Park, Colorado, USA, June.

Charlie Summers / Widefield view of the comet 46P / Wirtanen buzzing past the Pleiades during the early morning hours. Echo Lake, Colorado, USA. September 17, 2018.

Chase Dekker / Mountains reflected in lake, Maroon Bells, Aspen, Colorado

Jouan Rius / White faced ibis (Plegadis chihi) on Lake Powell, Glen Canyon Recreation Area, Arizona, USA, April 2014.