Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea, close to Little Brother Island. The Brothers Islands, Egy...

Nick Garbutt / Yacare Caiman (Caiman yacare) gaping to regulate its body temperature, with attendant hoverflies, the Paraguay River, Taiama Reserve, western Pantanal, Brazil, South America.

Roger Powell / Pair of Common shelduck (Tadorna tadorna) escorting their chicks. Cresswell Ponds Nature Reserve, Druridge Bay, Northumberland, England, UK, June.

Pascal Kobeh / Small and green armored pipefish / Longtail ghostpipefish (Solenostomus armatus) is escorting a brown robust / seagrass ghost pipefish (Solenostomus cyanopterus), Sulu sea, Philippines

David Fleetham / Trumpetfish (Aulostomus chinensis) escorting a Green Sea Turtle (Chelonia mydas) from where it will attempt to ambush unsuspecting fish. Maui, Hawaii.

Ralph Pace / Humpback Whale (Megaptera novaeangliae) female with escorting male, Maui, Hawaii, image taken under NMFS permit # 13846

John Waters / Two male Grayling (Thymallus thymallus) escorting a female, River Kennet, Berkshire, England, UK. March.

John Waters / Male Grayling (Thymallus thymallus) escorting and shaking against a female, River Kennet, Berkshire, England, UK. March.

Roger Powell / Blue-winged teal (Anas discors) male escorting female while feeding, La Chua Trail, Payne Priarie Reseve, Gainsville, Florida, USA, April

Roger Powell / Black swan (Cygnus atratus) female feeding and escorting cygnets. Werribee Sewerage Park, Victoria, Australia.

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by a group of Pilotfish (Naucrates ductor). Rocky Island, Egypt. Red Sea

Roger Powell / Greylag geese (Anser anser) escorting and protecting their chicks. Groote Vlak, Texel Island, The Netherlands.

Ernie Janes / Tugs escorting Container ship into Wellington harbour, view from Mount Victoria, North Island, New Zealand, 2009

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) female diving near cooperative male escort group, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 13846

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) female with male escort below, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 0753-1599

Roger Powell / Little bustard (Tetrax tetrax) pair at lek, male escorting female, Guerreiro, Portugal

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) Xiang Xiang, the first captive raised panda to be released into the wild with army escort, Wolong Nature Reserve, China

Roger Powell / Great Bustard {Otis tarda} male escorting and displaying to female at lek, Evora, Portugal

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) primary male escort, winner of the chase, stopped with female and other contenders in distance, Humpback Whale National Marine Sanctuary, Hawaii - notice must a...

Hiroya Minakuchi / Orca (Orcinus orca) mother and newborn calf with escort, Sea World, Kamogawa, Japan

Tui De Roy / Long-finned Pilot Whale (Globicephala melas) Department of Conservation rescue team escorting pod into deeper water after stranding, Golden Bay, South Island, New Zealand

Claus Meyer / South American River Turtle (Podocnemis expansa) biologist returning tiny turtles to the Trombetas River, Amazon, Brazil

Claus Meyer / South American River Turtle (Podocnemis expansa) biologist returning tiny turtles to the Trombetas River, Amazon, Brazil

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) mother and calf with male escort in foreground, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and escort, male hopes to mate when female comes into estrus, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) calf, mother, and male escort, Maui, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) calf and escorts, underwater

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, large calf and two male escorts, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) mother with calf, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow calf and male escort, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow and calf escorted by four males swimming in front, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and escorts, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Ralph Pace / Humpback Whale (Megaptera novaeangliae) female with escorting male, Maui, Hawaii, image taken under NMFS permit # 13846

Ralph Pace / Humpback Whale (Megaptera novaeangliae) female with escorting male, Maui, Hawaii, image taken under NMFS permit # 13846

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) primary escort (top) courting female (below) Humpback Whale National Marine Sanctuary, Maui, Hawaii - notice must accompany publication; photo obtained under NM...

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) primary escort (top) courting female (below) Humpback Whale National Marine Sanctuary, Maui, Hawaii - notice must accompany publication; photo obtained under NM...

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow calf and escort, Maui, Hawaii

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) cow, calf and escort followed by five other males, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Tui De Roy / Dugong (Dugong dugon) mother and calf and escort, Kai Islands, Maluku Islands, Indonesia

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...

Ralph Pace / Humpback Whale (Megaptera novaeangliae) calf surfacing with mother and escort below, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

Ralph Pace / Humpback Whale (Megaptera novaeangliae) mother and calf with escort, Maui, Hawaii, image taken under NMFS Permit # 19225

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.

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.