Anup Shah / Sumatran Orang utan baby swinging in tree {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) swimming in shallow crystal clear water, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) fins at frenzied surface, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) group swimming in shallow turquoise sea, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus), Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) approaching Grey heron (Ardea cinerea) in shallow water, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reefs sharks (Carcharhinus melanopterus) dorsal fins visible at sea surface at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) in shallow water gathering very close to shore, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) swimming in shallow crystal clear water, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) split level view of group hunting at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) swimming in shallows at sunset, Aldabra Atoll, Seychelles, Indian Ocean

Doug Perrine / Sixgill or Cow shark (Hexanchus griseus) tooth row from lower jaw on display at Oceanographic Museum of Monaco, Principality of Monaco (digitally modified)

Cheryl-Samantha Owen / Green flag emblazoned with the outline of a white shark means conditions, such as water visibility, the degree of wind, cloud cover or sun reflection on the waters surface, would allow surfers to spot...

Cheryl-Samantha Owen / Black flag with the outline of a white shark means conditions, such as water visibility, the degree of wind, cloud cover or sun reflection on the waters surface, would not allow surfers to spot any sh...

Cheryl-Samantha Owen / People installing shark exclusion nets designed to act as a barrier to sharks, but prevent capture or entanglement of marine animals. Fish Hoek Beach, near Cape Town, Western Cape, South Africa. July...

Cheryl-Samantha Owen / People installing shark exclusion nets designed to act as a barrier to sharks, but prevent capture or entanglement of marine animals. Fish Hoek Beach, near Cape Town, Western Cape, South Africa. July...

Cheryl-Samantha Owen / People installing shark exclusion nets designed to act as a barrier to sharks, but prevent capture or entanglement of marine animals. Fish Hoek Beach, near Cape Town, Western Cape, South Africa. July...

Cheryl-Samantha Owen / People installing shark exclusion nets designed to act as a barrier to sharks, but prevent capture or entanglement of marine animals. Fish Hoek Beach, near Cape Town, Western Cape, South Africa. July...

Cheryl-Samantha Owen / Pyjama shark (Poroderma africanum) curling into itself as a defensive, protective posture when thrown back into the sea. Kommetjie, Western Cape, South Africa.

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) in feeding frenzy very close to shore, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Grey reef shark (Carcharhinus amblyrhynchos), Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) tip just visible above sea surface, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) swimming in shallow crystal clear water, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) approaching Grey heron (Ardea cinerea) in shallow water, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus), Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) swimming in shallow crystal clear water, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) profile of dorsal fin, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) underside view of group patrolling shallow waters, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) approaching Grey heron (Ardea cinerea) in shallow water, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) swimming in mangrove forest, reflections above, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reefs shark (Carcharhinus melanopterus) swimming in shallow water at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus), Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reefs sharks (Carcharhinus melanopterus) dorsal fins visible at sea surface at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reefs shark (Carcharhinus melanopterus) swimming in shallow water at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus), swimming at night, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reefs shark (Carcharhinus melanopterus) swimming in shallow water at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus) in split level view in shallow water, Aldabra Atoll, Seychelles

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) in shallow above sandy seabed, Aldabra Atoll, Seychelles, Indian Ocean

Doug Perrine / Broadnose / Bluntnose sevengill shark / Spotted cow shark, {Notorynchus cepedianus} with Mackerel {Trachurus sp.} New Zealand, South Pacific Ocean.

Doug Perrine / Broadnose / Bluntnose sevengill shark / Spotted cow shark {Notorynchus cepedianus} accompanied by Koheru / Trevally / Scad {Decapterus koheru} New Zealand, South Pacific Ocean.

Doug Perrine / Broadnose / Bluntnose sevengill shark / Spotted cow shark {Notorynchus cepedianus} and scuba divers, New Zealand, South Pacific Ocean.

Doug Perrine / Broadnose / Bluntnose sevengill shark / Spotted cow shark, {Notorynchus cepedianus} with Mackerel {Trachurus sp.} New Zealand, South Pacific Ocean.

Ian Coleman / Illustration of Blunt-nose six-gill shark / Cow shark (Hexanchus griseus), Hexanchidae. Endangered / threatened species.