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

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

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.

Pete Oxford / Shoal of Silky sharks (Carcharhinus falciformis) Jardines de la Reina National Park, Cuba

Pete Oxford / Silky shark (Carcharhinus falciformis) Jardines de la Reina National Park, Cuba, Caribbean

Doug Perrine / Silky shark {Carcharhinus falciformis} Bahamas, Caribbean Sea, Atlantic Ocean (Non-ex).

Doug Perrine / Silky shark {Carcharhinus falciformis} Bahamas, Caribbean (Non-ex).

Doug Perrine / Silky shark {Carcharhinus falciformis} Bahamas, Caribbean Sea (Non-ex).

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.