John Cancalosi / Cross-Section of Utah Septarian Nodule, Utah. A type of geode, Utah Septarian Nodules are found about 15 miles east of Zion National park. They were formed in an ancient sea floor during the Cretaceou...

Heather Angel / Yellow lampshade poppy / Yellow poppywort (Meconopsis integrifolia) after rainfall. Sichuan Province, China.

Nick Hawkins / Greater flamingo (Phoenicopterus ruber) in flight. Isabela Island, Galapagos.

David Fleetham / Commerson's frogfish (Antennarius commerson) camouflaged against coral on bow of Alma Jane wreck, diver in background. Off Sabang Beach, Puerto Galera, Mindoro, Philippines. April 2017. Model rele...

Kirkendall-Spring / Cross country ski tracks on Amabilis Mountain, Mount Baker-Snoqualmie National Forest, Washington, USA. December

John Cancalosi / Cross section of a Septarian nodule, Morrocco.

Alex Mustard / Fingerprint cyphoma (Cyphoma signatum) mollusc feeding on soft corals. East End, Grand Cayman, Cayman Islands. Caribbean Sea.

Christophe Courteau / Garden spider / cross spider (Araneus diadematus) on web in urban street, France, October.

Pal Hermansen / Red cabbage (Brassica oleracea var. capitata f. rubra) cross section showing leaf spiral.

David Fleetham / Bluestreak cleaner wrasse (Labroides dimidiatus), two feeding on parasites on Topsail chub (Kyphosus cinerascens), over reef. Yap, Micronesia.

Jussi Murtosaari / Common hawker dragonfly (Aeshna juncea) male in flight, wings in x shape. Central Finland. September.