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.