Paul D Stewart / Engraving of an ape-like cave man accompanying an article by Boitard in the French 'Magasin Universel' (April 1838). This is the earliest reconstruction of a pre-historic human. It is striking that it...

David Fleetham / Two male Humpback Whales (Megaptera novaeangliae) competing for the privilege of accompanying a female. Hawaii.

Franco Banfi / Lemon shark (Negaprion brevirostris) with accompanying Remoras, Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Lemon shark (Negaprion brevirostris) with accompanying Remora, Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Lemon shark (Negaprion brevirostris) with accompanying Remora or suckerfish, Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Lemon shark (Negaprion brevirostris) with accompanying Remoras watched by scuba divers, Northern Bahamas, Caribbean Sea, Atlantic Ocean. March 2009.

Franco Banfi / Lemon sharks (Negaprion brevirostris) with accompanying Remoras, Northern Bahamas, Caribbean Sea, Atlantic Ocean

Franco Banfi / Lemon shark (Negaprion brevirostris) with accompanying Remoras, Northern Bahamas, Caribbean Sea, Atlantic Ocean

Nick Upton / British Divers Marine Life Rescue animal medics Simon Dolphin and Michelle Clement accompanying people carrying an injured Grey seal pup (Halichoerus grypus) 'Boggle' in a ventilated rescue bag, Crack...

David Fleetham / Oceanic whitetip shark (Carcharhinus longimanus), with dorsal fin protruding from sea surface, with pilot fish (Naucrates ductor) accompanying, Hawaii.

Paul D Stewart / Illustration of Gir Indian Lion (Panthera leo). Plate 24 from Volume 1 Trans. Zool. Soc. London, 1835, 'Some Account of the maneless Lion of Guzerat' with contemporary hand colouring as issued. The pl...

Paul D Stewart / 1834 steel engraving with contemporary hand colouring, the earliest coloured reconstruction of extinct fossil animals. It is from Guerin's Dictionnaire pittoresque Vol 1. plate 24. Numbered it include...

Paul D Stewart / Illustration of the extinct Falkland Island Wolf or Fox (Dusicyon australis). Hand coloured lithograph, Plate IV, The Zoology of the Voyage of H.M.S. Beagle, edited and superintended by Charles Darwin...

Franco Banfi / Loggerhead sea turtle (Caretta caretta) accompanied by Imperial blackfish (Schedophilus ovalis) swimming, Vulnerable (IUCN). Azores, Atlantic Ocean.

Franco Banfi / Loggerhead sea turtle (Caretta caretta) accompanied by Imperial blackfish (Schedophilus ovalis) and Pilot fish (Naucrates ductor) Vulnerable (IUCN). Azores, Atlantic Ocean.

Roland Seitre / Double-wattled cassowary (Casuarius casuarius) chick accompanied by a man, Australia. Captive. IUCN: Vulnerable.

Doug Perrine / Aerial view of female Humpback whale (Megaptera novaeangliae) with calf underneath and male escort (right) passing by kayakers, Hawaii Humpback Whale National Marine Sanctuary, East Maui, Hawaii, Paci...

Doug Perrine / Oceanic whitetip shark (Carcharhinus longimanus) accompanying a pod of Short-finned pilot whales (Globicephala macrorhynchus), Big Island, Hawaii, Pacific Ocean.

Doug Perrine / Humpback whale (Megaptera novaeangliae) female and calf being escorted by male, with Mackerel scad (Decapterus macarellus) swimming around them, Kohala, Hawaii, Pacific Ocean.

Doug Perrine / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by Pilot fish (Naucrates ductor), and small Remora (Remora sp.) fish, Big Island, Hawaii, Pacific Ocean.

Pal Hermansen / Two adult Emperor penguins (Aptenodytes forsteri) accompanying a small group of chicks walking towards camera, the chicks pause and the adults move past them, with one leaving the frame, Snow Hill Isl...

Mark Carwardine / Humpback whale (Megaptera novaeangliae), mother and calf with male escort, aerial view. Baja California, Mexico. March.

Mark Carwardine / Humpback whale (Megaptera novaeangliae) female and calf with male escort, aerial view. Baja California, Mexico. March.

Mark Carwardine / Humpback whale (Megaptera novaeangliae) female and calf together with male escort, aerial view. Baja California, Mexico. March.

Mark Carwardine / Humpback whale (Megaptera novaeangliae) female and calf with male escort, aerial view. Baja California, Mexico. March.

Mark Carwardine / Aerial shot of a male Humpback whale (Megaptera novaeangliae) escorting a female (middle), with another male trying to get access, Baja California, Mexico.

Mark Carwardine / Aerial shot of a male Humpback whale (Megaptera novaeangliae) escorting a female (middle), with two other males trying to get access, Baja California, Mexico.

Tony Wu / Rear view of a male Humpback whale (Megaptera novaeangliae australis) engaged in a dominance display by blowing a stream of air bubbles. Visible in the top left background is a female humpback whale....