Marine Mammals

A new study has revealed the exact origin of the Pacific Ocean's mysterious "biotwang" noises, which were first detected by underwater surveys near the Mariana Trench in 2014.

A stock image of an Indo-Pacific dolphin swimming (not the individual responsible for the recent attacks).

Orcas off the coasts of Spain and Portugal may be using boats as targets to practice hunting their favorite food, Atlantic bluefin tuna.

Drone captures footage of a humpback whale missing its tail fluke — an injury suspected to be from long-term entanglement in fishing gear.

Coastguards had to tow a 40-foot-long sailboat back to port after two young orcas severely damaged the boat's rudder near Guilvinec in the French region of Brittany.

A beaked whale that recently washed up dead on a New Zealand beach likely belongs to the world's rarest cetacean species. If confirmed, researchers could dissect the species for the very first time.

A string of fur seal attacks on surfers and beachgoers in Cape Town has been linked to an outbreak of rabies, with 11 seals testing positive for the virus so far.

Dozens of long-finned pilot whales have beached and died on Sanday in the Orkney Islands, Scotland, in the biggest mass stranding the country has seen since 1995.

Records of orcas hunting sharks in the Gulf of California are on the rise, as experts say we may have underestimated how much this happens.

Researchers snapped a photo of a baby Irrawaddy dolphin in a group of Indo-Pacific humpback dolphins swimming off the coast of Cambodia.