Martin Willis / Victoria's Riflebird (Ptiloris victoriae) male in courtship display, Atherton Tableland, Queensland, Australia. Sequence 2 of 3

Alan Murphy/ BIA / Baltimore Oriole (Icterus galbula) males fighting, Texas

Alan Murphy/ BIA / Baltimore Oriole (Icterus galbula) males fighting, Texas

Paul Souders/ Worldfoto / Black Heron (Egretta ardesiaca) canopy hunting, Chobe River, Chobe National Park, Botswana

Donald M. Jones / American Avocet (Recurvirostra americana) pair courting, Montana

Thomas Marent / Sparkling Violet-ear (Colibri coruscans) hummingbird bathing, Bogota, Colombia

Chase Dekker / Common Loon (Gavia immer) spreading wings, Monterey Bay, California

Ingo Arndt / Upland Goose (Chloephaga picta) male stretching, Torres del Paine National Park, Patagonia, Chile

Alan Murphy/ BIA / Northern Cardinal (Cardinalis cardinalis) male and Pyrrhuloxia (Cardinalis sinuatus) male fighting, Texas

Benjamin Olson / Gentoo Penguin (Pygoscelis papua) wading, Antarctica

Benjamin Olson / Gentoo Penguin (Pygoscelis papua) wet from rain due to climate change, Antarctica

Donald M. Jones / Common Loon (Gavia immer) stretching, Troy, Montana