Heike Odermatt / Black-browed Albatross (Thalassarche melanophrys) pair courting, Saunders Island, Falkland Islands

Tui De Roy / Blue-footed Booby (Sula nebouxii) pair courting, Santa Cruz Island, Galapagos Islands, Ecuador

Heike Odermatt / Black-browed Albatross (Thalassarche melanophrys) chick begging for food, Falkland Islands

Pete Oxford / Black-browed Albatross (Thalassarche melanophrys) pair courting, Steeple Jason Island, Falkland Islands

Tom Vezo / Tufted puffins {Lunda cirrhata} billing, Alaska. Saint Paul Island

Gabriel Rojo / Toco toucan (Ramphastos toco) pair billing in tree. Pantanal forest, Mato Grosso, Brazil.

George Sanker / Black-necked stilt (Himantopus mexicanus) pair billing. Myakka River State Park, Florida, USA. February.

Heather Angel / Brown headed gull (Chroicocephalus brunnicephalus) pair billing on water. Qinghai Lake, Qinghai Province, China. May.

Tui De Roy / Nazca booby (Sula granti), pair billing. Genovesa Island, Galapagos. May 2015.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) pair billing with Slate pencil urchins (Eucidaris sp) on rocks below. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) pair billing with Slate pencil urchins (Eucidaris sp) on rocks below. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), pair billing, at nest. Cape Douglas, Fernandina Island, Galapagos.