Nick Hawkins / Silky shark (Carcharhinus falciformis). Cocos Island National Park, Costa Rica.

Claudio Contreras / Silky shark (Carcharhinus falciformis) two swimming together, Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January. Vulnerable species.

Shane Gross / Silky shark (Carcharhinus falciformis). Caribbean Sea off Gardens of the Queen National Park, Cuba.

Shane Gross / Silky shark (Carcharhinus falciformis), three in open ocean. Caribbean Sea off Gardens of the Queen National Park, Cuba.

Shane Gross / Silky shark (Carcharhinus falciformis), three in Caribbean Sea off Gardens of the Queen National Park, Cuba.

Claudio Contreras / Silky shark (Carcharhinus falciformis), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January. Vulnerable

Claudio Contreras / Silky Shark (Carcharhinus falciformis), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January. Vulnerable species.

Alex Mustard / Young Silky shark (Carcharhinus falciformis) swimming beneath the surface of the ocean, Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Alex Mustard / Portrait of a young Silky shark (Carcharhinus falciformis). Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Franco Banfi / Shoal of Silky sharks (Carcharhinus falciformis) Malpelo Island National Park, UNESCO World Heritage Site, Colombia, East Pacific Ocean

Franco Banfi / Shoal of Silky sharks (Carcharhinus falciformis) Malpelo Island National Park, UNESCO World Heritage Site, Colombia, East Pacific Ocean

Claudio Contreras / Silky Shark (Carcharhinus falciformis), Socorro Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico, March

Claudio Contreras / Silky shark (Carcharhinus falciformis) with hook and line stuck in mouth, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico, March

Claudio Contreras / Silky Shark (Carcharhinus falciformis) and Bigeye Trevally (Caranx sexfasciatus), Silky Shark IUCN Near Threatened, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands),...

Claudio Contreras / Silky Shark (Carcharhinus falciformis), IUCN Near Threatened, Socorro Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico, March

Claudio Contreras / Silky Shark (Carcharhinus falciformis), IUCN Near Threatened, Socorro Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico, March

Claudio Contreras / Silky Shark (Carcharhinus falciformis) and plankton, IUCN Near Threatened, Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Sit...

Doug Perrine / Silky shark (Carcharhinus falciformis) teeth from upper and lower jaws on display at Oceanographic Museum of Monaco, Principality of Monaco (digitally modified)

Alex Mustard / A diver has a dramatic close encounter with Silky shark (Carcharhinus falciformis) Cat Island, Bahamas. Tropical North Atlantic Ocean

Franco Banfi / Silky shark (Carcharhinus falciformis) under the boat with divers doing decompression, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve, Socorro Islands, Western Mexico

Franco Banfi / Silky shark (Carcharhinus falciformis) San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve, Socorro Islands, Western Mexico

Franco Banfi / Scuba divers and Silk Shark (Carcharinus falciformis), Roca Partida close to San Benedicto island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico

Jordi Chias / Silky shark (Carcharhinus falciformis) at night, Socorro Islands. Mexico, Pacific Ocean

Jordi Chias / Silky shark (Carcharhinus falciformis) Jardines de la Reina / Gardens of the Queen reefs, South Cuba, Caribbean

Jordi Chias / Silky shark (Carcharhinus falciformis) Jardines de la Reina / Gardens of the Queen reefs, South Cuba, Caribbean

Pascal Kobeh / Scalloped hammerhead (Sphyrna lewini) and a Silky shark (Carcharhinus falciformis) in a net. Malpelo Sanctuary, Colombia, Pacific Ocean.

Pascal Kobeh / Silky shark (Carcharhinus falciformis) with a Scalloped hammerhead (Sphyrna lewini) in the background, Cocos island, Costa Rica. Pacific ocean.

Pascal Kobeh / School of Silky sharks (Carcharhinus falciformis) in open water, Revillagigedo islands, Mexico. Pacific Ocean.

Chris & Monique Fallows / Silky shark (Carcharhinus falciformis) Cape Point, South Africa.

Lucas Bustamante / Five Silky sharks (Carcharhinus falciformis) swimming close to surface, Revillagigedo Archipelago, Baja California, Mexico, Pacific Ocean.

Noemie Stroh / Silky shark (Carcharhinus falciformis) female swimming past a cleaning station, San Benedicto, Revillagigedo Islands, Mexico, December.

Noemie Stroh / Silky shark (Carcharhinus falciformis) female swimming past a cleaning station, San Benedicto, Revillagigedo Islands, Mexico, December.

Shane Gross / Two Humpback whales (Megaptera novaeangliae) nose to nose, Moorea, French Polynesia, Pacific Ocean.

Shane Gross / Silky shark (Carcharhinus falciformis) swimming through sunlit water, Tubuai, French Polynesia, Pacific Ocean.

Shane Gross / Silky shark (Carcharhinus falciformis), Tubuai, French Polynesia, Pacific Ocean.

Shane Gross / Silky shark (Carcharhinus falciformis) swimming near the surface, Tubuai, French Polynesia, Pacific Ocean.

Doug Perrine / Dead juvenile Silky shark (Carcharhinus falciformis) entangled in a derelict fishing net (ghost net ) attached to a homemade FAD ( fish aggregating device), off the Kona Coast, Hawaii.

Alex Mustard / Pelagic silky shark (Carcharhinus falciformis) beneath the surface of the ocean. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Alex Mustard / Pelagic silky shark (Carcharhinus falciformis) swimming beneath the surface of the ocean. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Claudio Contreras / Silky shark (Carcharhinus falciformis) Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba.

Claudio Contreras / Silky Shark (Carcharhinus falciformis) with hook, Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba.

Claudio Contreras / Silky shark (Carcharhinus falciformis), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba.

Claudio Contreras / Silky Shark (Carcharhinus falciformis), and Yellowtail Snapper (Ocyurus chrysurus), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba.

Noemie Stroh / Silky shark (Carcharhinus falciformis) swimming through a shoal of juvenile fish, Red Sea, Habili Lori, Sudan.

Pascal Kobeh / Silky shark (Carcharhinus falciformis) close to the surface and near boat with Black jacks / Trevally (Caranx lugubris) and diver in the background, Revillagigedo islands, Mexico. Pacific Ocean. Model...