Harbor porpoises, also known as common porpoises, are some of the smallest cetaceans, usually measuring between 4.6 to 6.2 feet and weighing between 99 and 143 pounds.

We also have toothed whales here, harbor porpoises, Atlantic white-sided dolphins, common dolphins, bottlenose dolphins, pilot whales, an occasional sperm whale, and killer whales.

The Yangtze porpoise (Neophocaena asiaeorientalis) used to be a common sighting in the Yangtze River. Boaters would watch their sleek silhouettes break the surface like ghosts from the deep. Today ...

For centuries, the Yangtze porpoise was a common sight on the river it is named after. Now, the freshwater mammal is critically endangered, rarely sighted, and only found in a tiny proportion of ...

Chinese scientists trace the Yangtze finless porpoise's history in Asia’s longest river–for conservation.

And while each case is heartbreaking on its own, it's part of a much bigger pattern. Experts make 'most distressing' discovery after examining stranded porpoise: 'It was quite emotional for all of ...

Going after porpoises might benefit their group coordination and teamwork. This theory may be reminiscent of the orcas who became famous for sinking boats in Spain and Portugal.

Four dolphins and a harbor porpoise have been found dead on or near beaches in New Jersey since Thursday, officials said Monday. Adult male common dolphins were found stranded in Sea Isle City and ...

People across the UK are being invited to take part in nationwide effort to spot whales, dolphins and porpoises.

The burnt remains of a harbour porpoise have been found on a beach. The creature's carcass was pictured on social media in the dunes of Redcar beach. Experts say it is common for porpoises to ...

The Yangtze finless porpoise faced habitat loss and a reduced range as a result of sand mining, but a suspension offers hope that they could recover.

Why do killer whales harass porpoises without eating them? Scientists from UC Davis' SeaDoc Society and Wild Orca investigate a perplexing behavior.