Florian Graner / Harbour porpoise {Phocoena phocoena} Sognefjord, Norway. Composite

Flip Nicklin / Vaquita (Phocoena sinus) by-catch casualty, Baja California, Mexico

Florian Graner / Harbour porpoise {Phocoena phocoena} off Isle of Man, Irish Sea, UK. Digital composite

Yumiko Wakisaka / Vaquita (Phocoena sinus)

Yumiko Wakisaka / Spectacled Porpoise (Phocoena dioptrica)

Yumiko Wakisaka / Harbor Porpoise (Phocoena phocoena)

Flip Nicklin / Researcher Jonathan Stern, Ph.D., of Golden Gate Cetacean Research reviewing Harbor Porpoise (Phocoena phocoena) id images, California

Flip Nicklin / Vaquita (Phocoena sinus) killed in gill net intended for sharks, Sea of Cortez near San Felipe, Mexico

Tui De Roy / Harbor Porpoise (Phocoena phocoena) meat for sale at modern Inuit market, Nuuk, Greenland

Flip Nicklin / Harbor Porpoise (Phocoena phocoena) released by researcher Andrew Read which had been accidentally caught in a herring trap, Bay of Fundy, Canada

Flip Nicklin / Harbor Porpoise (Phocoena phocoena) which had been accidentally caught in a herring trap being hydrated by researchers and fisherman, Bay of Fundy, animal was subsequently tagged and released, Canada

Flip Nicklin / Vaquita (Phocoena sinus) by-catch mortality, caught in gill net for sharks and other fish, Gulf of California, Mexico