John Cancalosi / Stuffed specimen of Ivory billed woodpecker {Campephilus principalis} USA Louisiana - believed extinct until sighting in 2005

Espen Bergersen / Rare sighting of Risso's dolphin (Grampus griseus) photographed just before midnight. Outside Andoya, Northern Norway. November.

Ann & Steve Toon / Save the Rhino Trust trackers on patrol in the field, from Ugab river camp, Save the Rhino Trust, Damaraland, Namibia, May 2013

Ann & Steve Toon / Save the Rhino Trust trackers recording data following rhino sighting in the Ugab river area, Save the Rhino Trust, Damaraland, Namibia, May 2013

Ann & Steve Toon / Save the Rhino Trust tracker, Dansiekie Ganaseb, recording black rhino sighting, Palmwag concession, Kunene region, Namibia, May 2009. Editorial use only

Ann & Steve Toon / Save the Rhino Trust tracker Dansiekie Ganaseb, recording black rhino sighting, Palmwag concession, Kunene region, Namibia, May 2009. Editorial use only

Ann & Steve Toon / Save the Rhino Trust tracker, recording black rhino sighting, Palmwag concession, Kunene region, Namibia, May 2009. Editorial use only

Ann & Steve Toon / Save the Rhino Trust trackers, Erwin Karatjiva (crouching) and Dansiekie Ganaseb(right), with Wilderness Safaris guide Gotlod Hawaxab (left), recording black rhino sighting, Palmwag concession, Kunene...

Ann & Steve Toon / Save the Rhino Trust trackers, Erwin Karatjiva and Dansiekie Ganaseb, recording black rhino sighting, Palmwag concession, Kunene region, Namibia, May 2009. Editorial use only

Mark Hamblin / 2020VISION / Man looking at list of recent bird sightings in Forsinard Flows RSPB visitor centre, Flow Country, Sutherland, Scotland, UK, June 2011

Roy Mangersnes / The first sight of South Georgia from boat window, Southern Ocean, Antarctica. November

Roger Powell / Hawk Owl {Surnia ulula} female on edge of nest, sighting male approaching with food, Lapland, Finland

Roger Powell / Hawk Owl {Surnia ulula} female on edge of nest, sighting male approaching with food, Lapland, Finland

Roger Powell / Hawk Owl {Surnia ulula} female on edge of nest, sighting male approaching with food, Lapland, Finland

WILLIAM OSBORN / Spinifex grassland habitat, Birds Australia reserve, Northern Territory, Australia

Pete Cairns / Traffic parked on road side as tourists view a 'bear sighting' Yellowstone NP, Wyoming, USA

Barry Bland / A man navigating by Sextant, a measuring instrument generally used to measure the angle of elevation of a celestial object above the horizon. Model Released. ^^^Making this measurement is known as sig...

Barry Bland / A man navigating by Sextant, a measuring instrument generally used to measure the angle of elevation of a ^^^celestial object above the horizon. Making this measurement is known as sighting the object...

David Fleetham / Great barracuda (Sphyraena barracuda) swimming in open ocean, an unusual sighting in Hawaii, Hawaii, Pacific Ocean.

Oriol Alamany / Guide signing the mountain gorilla sighting diplomas (Gorilla beringei beringei), Volcanoes National Park, Rwanda, July