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A group of resident bottlenose dolphins (Tursiops truncatus) travel through the Moray Firth, Scotland. Natural nick marks can be seen on one dorsal fin, these marks are used for photographic identification by marine biologists.

Cuvier's beaked whale (Ziphius cavirostris) stranded with visible round marks left by squid prey as they use the suckers on their tentacles to aviod being swallowed. Ionian Sea, Greece.

Diver observing soft corals growing on the remains of a cargo container. Shark and Yolanda, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Green Sea Turtle (Chelonia mydas) near to the surface. Machalilla National Park, Ecuador. Pacific Ocean, Ecuador

Coral Grouper (Cephalopholis miniata) being cleaned by a BruunÌs Cleaning Partner Shrimp (Urocaridella aontonbruunii) this incredible gaping action allows the shrimp uninhibited access to the mouth and gills. Red Sea.

Humpback Whale (Megaptera novaeangliae) fluke-up dive (note the Orca tooth rake marks on the right side of the tail) in Icy Strait, Southeast Alaska, USA.

Mountain coral (Porites lutea) with diver exiting the water at the surface. Ras Umm Sid, Sharm El Sheikh, South Sinai, Red Sea, Egypt.

Titan Triggerfish (Balistoides viridescens). The largest of the triggerfish family and often aggressive when approached especially whilst nesting.Red Sea.

Yellow Sweeper (Parapriacanthus ransonneti) Live by day in dense groups and moving into open water to feed on plankton at night.Red Sea.

Titan Triggerfish (Balistoides viridescens). The largest of the triggerfish family and often aggressive when approached especially whilst nesting.Red Sea.

Adult Sperm Whale bull (Physeter macrocephalus) surfacing (note tooth rake marks on melon) in the upper Gulf of California (Sea of Cortez), Mexico.

Research diver approaching manta birostris to record detail in research program, Project Elasmo. Pacific Ocean, Ecuador

Spanish Dancer (Hexabranchus sanguineus) Spectacular and largest of the nudibranchs (naked gills) and are reported to reach up to 50 cms in length. Nocturnal. Red Sea.

Research diver approaching manta birostris to record detail in research program, Project Elasmo. Pacific Ocean, Ecuador

Coral Grouper (Cephalopholis miniata) being cleaned by a BruunÌs Cleaning Partner Shrimp (Urocaridella aontonbruunii) this incredible gaping action allows the shrimp uninhibited access to the mouth and gills. Red Sea.

Green Sea Turtle (Chelonia mydas) near to the surface. Machalilla National Park, Ecuador. Pacific Ocean, Ecuador

Research diver approaching manta birostris to record detail in research program, Project Elasmo. Pacific Ocean, Ecuador

Spanish Dancer (Hexabranchus sanguineus). Spectacular and largest of the nudibranchs (naked gills) and are reported to reach up to 50 cms in length. Nocturnal. Red Sea.

Green Sea Turtle (Chelonia mydas) near to the surface. Machalilla National Park, Ecuador. Pacific Ocean, Ecuador

Common dolphin (Delphinus delphis) showing a large number of rake marks on its back inflicted by the teeth of other common dolphins. Hebrides, West coast of Scotland.

Green Sea Turtle (Chelonia mydas) near to the surface. Machalilla National Park, Ecuador. Pacific Ocean, Ecuador

Yellow Sweeper (Parapriacanthus ransonneti). Live by day in dense groups and moving into open water to feed on plankton at night.Red Sea.

Research diver approaching manta birostris to record detail in research program, Project Elasmo. Pacific Ocean, Ecuador