Expedition documents epic clash of titans: orcas versus sperm whales

Rare sighting made off Sri Lanka; underwater footage said to be first-ever

A recent photo expedition off Sri Lanka in search of blue whales instead produced a far more extraordinary sighting: that of killer whales in a dramatic 30-minute assault on sperm whales.
There seemed to be five killer whales, or orcas, versus perhaps six sperm whales, which were postured defensively throughout an attack by smaller but much swifter mammals.

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