Todd Pusser / Dall's porpoise at surface {Phocoenoides dalli}, Central Bering Sea, Alaska
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Florian Graner / Harbour porpoise {Phocoena phocoena} off Isle of Man, Irish Sea, UK. Digital composite
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Mark Carwardine / Harbour porpoises (Phocoena phocoena) - rare picture of small group Bay of Fundy, New Brunswick, Canada
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Mark Carwardine / Harbour porpoises (Phocoena phocoena) trapped inside herring weir off the coast of Nancy's Head, Campobello Island, Bay of Fundy, New Brunswick, Canada. September 2018
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SCOTLAND: The Big Picture / Harbour porpoise (Phocoena phocoena), wild group. Shetland, Scotland, UK, October.
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Nick Hawkins / Harbour porpoise, (Phocoena phocoena) Bay of Fundy, New Brunswick, Canada, August.
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Rebecca Robinson / Illustration of Killer whale / Orca (Orcinus orca) breaching sequence in profile, showing how it catches seals and porpoises / dolphins.
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Brent Stephenson / Dall's porpoise (Phocoenoides dalli) two breaking the surface with their characteristic rooster tail of spray, off Kayak Island, Alaska, United States, July.