Tooth rake marks on an adult male orca's dorsal fin indicate fighting or rough play with other killer whales, said animal behavior scientist Charli Grimes of the UK's University of Exeter.

It was an orca-versus-dolphin matchup, and the dolphin didn’t stand a chance. In coastal waters near Chile in 2023, a massive female killer whale walloped the much smaller dolphin, sending it ...

The research drew on 50 years of orca surveys conducted off the Pacific coast by the Center for Whale Research in Washington State.The photographs of 103 killer whales showed which swam together and ...

An endangered Pacific Northwest orca that made global headlines in 2018 for carrying her dead calf for over two weeks is doing so once again following the death of her new calf, in another sign of ...

The scientists also discovered signs of orca tooth rake marks on the dorsal fin of a fin whale (Balaenoptera physalus). While there are no observations of orcas hunting fin whales, ...

An adult male orca with tooth rake marks. Credit. COPYRIGHT David Ellifrit, Center for Whale Research. Usage Restrictions. Credit must be given to the creator.

Both papers examine "rake markings," where an orca has run its teeth along another. Naomi Rose, a marine mammal scientist at the Animal Welfare Institute and an orca expert, ...

Estimated 11.5-foot female great white shark (Carcharodon carcharias) bearing tooth-rake marks by an orca (Orcinus orca) on the left side of its trunk, observed on 7 July, 2017, in False Bay ...

Older, "post-menopausal" orca mothers protect their adult sons from fights, according to new research. The study examined tooth rake marks on the animals' bodies - inflicted in confrontations with ...