Stephane Granzotto / Tracking shot of a pod of Euphrosyne dolphins (Stenella coeruleoalba) swimming, Mediterranean Sea, August.

Richard Herrmann / Pacific White-sided Dolphin (Lagenorhynchus obliquidens) pod, Nine Mile Bank, San Diego, California

Pedro Narra / Two people helping a stranded Striped dolphin (Stenella coeruleoalba) in the surf, Troia, Sado Estuary, Portugal

Martin Camm / Carwardine / Illustration of Striped dolphin (Stenella coeruleoalba), Delphinidae (Wildlife Art Company).

Doug Perrine / Striped dolphin leaping {Stenella coeruleoalba} Azores, Portugal, North Atlantic (Non-ex).

Doug Perrine / Pod of Striped dolphins porpoising {Stenella coeruleoalba} Azores, North Atlantic (Non-ex).

Doug Perrine / Striped dolphins travelling at speed {Stenella coeruleoalba} Azores, Atlantic (Non-ex).

Doug Perrine / Striped dolphin travelling at speed {Stenella coeruleoalba} Azores, Atlantic (Non-ex).

Richard Herrmann / Pacific White-sided Dolphin (Lagenorhynchus obliquidens) surfacing, Mission Beach, San Diego, California

Richard Herrmann / Pacific White-sided Dolphin (Lagenorhynchus obliquidens) surfacing, Mission Beach, San Diego, California

Chase Dekker / Pacific White-sided Dolphin (Lagenorhynchus obliquidens) leaping, Monterey Bay, California

Richard Herrmann / Pacific White-sided Dolphin (Lagenorhynchus obliquidens) pair hunting Northern Anchovy (Engraulis mordax), Nine Mile Bank, San Diego, California