Australian Dolphins Invent Shell-Trap Hunting 4,000 Kilometres Apart
Updated
Updated · spacedaily.com · Aug 17
Australian Dolphins Invent Shell-Trap Hunting 4,000 Kilometres Apart
3 articles · Updated · spacedaily.com · Aug 17
Summary
A new Marine Mammal Science study reports the first published Queensland records of bottlenose dolphins using empty sea-snail shells to trap fish, matching a rare foraging tactic long documented in Shark Bay.
Nearly 4,000 kilometres separate Hervey Bay and Shark Bay, and researchers say that gap makes direct copying between the two dolphin populations implausible, supporting independent innovation under similar ecological conditions.
Two 2025 Hervey Bay encounters provided the clearest evidence: adult females Stevie Nicks and Maserati lifted baler shells to the surface, and Maserati’s calf Bentley handled the same shell three minutes later in a similar way.
The Queensland evidence remains limited—three dolphins, two detailed encounters and older 2013 and 2019 photos—so researchers could not confirm successful catches or prove exactly how the behaviour first arose there.
The findings fit earlier Shark Bay work showing shelling can spread socially after it appears, suggesting dolphin tool use may emerge more than once and then persist locally as culture.