Jordi Chias / Giant Manta (Manta birostris) with Remoras (Remora brachyptera) attached to both wings, offshore Santa Maria Island, Azores, Atlantic Ocean

Constantinos Petrinos / Peacock-tail anemone shrimp (Periclimenes brevicarpalis) living commensally with the Branching Sea Anemone (Actinodendron glomeratum). Lembeh Strait, North Sulawesi, Indonesia.

Denis-Huot / Grant's zebra (Equus burchelli granti) mutual grooming after a bush fire, Masai-Mara Game Reserve, Kenya. October.

Gabriel Rojo / Cattle tyrant (Machetornis rixosus) perched on capibara??Hydrochoerus hydrochaeris) Ibera Marshes, Corrientes Province, Argentina

Ben Cranke / Hyacinth Macaws (Anodorhynchus hyacinthinus) grooming each other, Piaui, Brazil. August.

Roger Powell / Cattle egret (Bubulcus ibis) perched on the back of a sheep, with another on the ground, Castro Verde, Alentejo, Portugal, April.

Sandesh Kadur / Wild Gaur (Bos gaurus) with birds on skin, feeding on insects, Western Ghats, Southern India

Alex Mustard / Pederson cleaner shrimp (Periclimenes pedersoni) cleaning the eye of a Nassau grouper (Epinephelus striatus), Bloody Bay Wall, Little Cayman, Cayman Islands. British West Indies, Caribbean Sea.

Alex Mustard / Glasseye snapper (Heteropriacanthus cruentatus) head portrait with a cleaning Goby (Gobiosoma genie) East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Doug Perrine / Green sea turtle (Chelonia mydas) being cleaned of algae by Yellow tangs / surgeonfish (Zebrasoma flavescens), Puako, Kona, Hawaii, USA, June, Endangered species

Doug Perrine / Green sea turtle (Chelonia mydas) cleaned of algae by Yellow tangs / surgeonfish (Zebrasoma flavescens), Puako, Kona, Hawaii, USA, June, Endangered species

Juergen Freund / Manta rays (Manta birostris) at cleaning station being cleaned by wrasses, Moluccas Islands, Indonesia.

Juergen Freund / Coleman shrimp (Periclimenes colemani) on a Fire urchin (Asthenosoma varium) Moluccas Islands, Indonesia.

Juergen Freund / Spine-cheek anemonefish (Premnas biaculeatus) with baby amongst anemone tentacles, Bali, Indonesia, Indo-pacific.

Juergen Freund / Giant manta ray (Manta birostris) at a cleaning station, seen from behind. North Raja Ampat, West Papua, Indonesia

Juergen Freund / Giant manta ray (Manta birostris) at a cleaning station. North Raja Ampat, West Papua, Indonesia.

Juergen Freund / Giant manta ray (Manta birostris) at a cleaning station with diver swimming behind it. North Raja Ampat, West Papua, Indonesia.

Juergen Freund / A parade of giant manta rays (Manta birostris) at a cleaning station. North Raja Ampat, West Papua, Indonesia,

Juergen Freund / Giant manta rays (Manta birostris) at a cleaning station. North Raja Ampat, West Papua, Indonesia.

Juergen Freund / Pygmy seahorse (Hippocampus bargibanti) camouflaged in a fan coral. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Denise's pygmy seahorse (Hippocampus denise) in its fan coral. Misool, Raja Ampat, West Papua, Indonesia,

Juergen Freund / Clark's anemonefish / Yellowtail clownfish (Amphiprion clarkii) prreing out from anemone tentacles. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Denise's pygmy seahorse (Hippocampus denise) in its fan coral. Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / True clownfish / Clown anemonefish (Amphiprion percula) tending its eggs. Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Carrier / Sea urchin crab (Dorippe frascone) carrying a fire urchin as a deterrent to predators. Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Pygmy seahorse (Hippocampus bargibanti) camouflaged on coral (Muricela sp). Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Oceanic sunfish (Mola mola) with bannerfish and angelfish cleaning it. Taken at 42 meters. Nusa Penida, Lesser Sunda Islands, Indonesia,

Juergen Freund / True clownfish / Clown anemonefish (Amphiprion percula) tending its eggs. Misool, Raja Ampat, West Papua, Indonesia0

Patricio Robles Gil / Silhouetted Capivara / Capibara (Hydrochoerus hydrochaeris) with Cattle Tyrant (Machetornis rixosa), which feeds on flies approaching the Capibara. Parana, Southern Brazil.

Georgette Douwma / Pink anemonefish (Amphiprion perideraion) with anemone showing the effects of bleaching. The bleached anemone is almost white, whereas the unbleached anemone is brown due to the presence of symbiotic...

Alex Mustard / Florida manatee (Trichechus manatus latirostrus) being cleaned by blue gill sunfish (Lepomis macrochirus). Three Sisters Spring, Crystal River, Florida. USA. February 2010

Alex Mustard / Giant Pacific Manta Ray (Manta birostris) portrait with Remora fish (Echeneididae) Roca Partida, Revillagigedos Islands, Mexico. East Pacific Ocean. February

Anup Shah / Cape buffalo (Syncerus caffer) head portrait of male, with Cattle egret on its back (Bubulcus ibis). Masai Mara National Reserve, Kenya. February.

David Fleetham / Hawaiian pom-pom / boxer crab (Lybia edmondsoni)with anemones (Triactis sp) that it carries around holding with the claws and using them for defense, waving in front of the possible aggressor. An exam...

Doug Perrine / Female Bull sharks (Carcharhinus leucas) in seasonal breeding aggregation with Sharksuckers (Echeneis naucrates) Playa del Carmen, Cancun, Quintana Roo, Yucatan Peninsula, Mexico (Caribbean Sea)

Jeff Rotman / Blacktip shark (Carcharhinus limbatus) with symbiotic Pilot fish (Naucrates ductor) swimming below, Cocos island, Costa Rica - Pacific ocean.

Jeff Rotman / Great White shark (Carcharodon carcharias) swimming with symbiotic Pilot fish (Naucrates ductor) and schooling Mackerel scad (Decapterus macarellus) Guadalupe Island, Mexico, Pacific Ocean.

Georgette Douwma / Sea pen (Virgularia gustaviana) with a small porcelain crab on sandy sea bed, purple form. Rinca, Indonesia.

Georgette Douwma / Loki whip goby (Bryaninopss loki) on Sea pen (Virgularia gustaviana). Komodo National Park, Indonesia

Doug Allan / Humpback whale (Megaptera novaeangliae) mother and calf, female with Remoras on underside, Vava'u, Kingdom of Tonga, South Pacific, September. Not available for ringtone/wallpaper use.

Pete Oxford / Steel pompano fish (Trachinotus stilbe) cleaning Galapagos green turtle (Chelonia mydas agassizi) off Wolf Island, Galapagos Islands

Juergen Freund / Soft coral crab / Dendronephthya crab (Hoplophrys oatesii) camouflaged on the tip of a soft coral. Indo-pacific

Luis Quinta / Devil ray {Mobula tarapacana} with remora, Azores, Atlantic

Georgette Douwma / Clown anemonefish (Amphiprion percula) amongst tentacles of a blue variety of anemone (Stichodactyla gigantea) Raja Ampat, West Papua, Indonesia.