Full Breakdown
Shelling Observed in Queensland Dolphins: New Evidence of Maternal Tool-Use Transmission
8/13/2026, 12:05:13 PM
Core Event
Indo-Pacific bottlenose dolphins (*Tursiops aduncus*) were filmed using large, empty seashells to trap fish off Hervey Bay in Queensland’s Great Sandy Marine Park. The behavior—known as “shelling”—involves a dolphin driving a fish into a vacant gastropod shell, lifting it, and tipping it so the prey falls into the mouth. Drone footage captured an adult female and her calf performing the technique together, suggesting possible maternal transmission.
Background: Tool Use and Prior Records
Shelling was first described in Shark Bay, Western Australia, with a 2011 report and a 2020 analysis of 42 video observations that documented horizontal learning among pod members. Until the Queensland sightings, Shark Bay was the only confirmed site.
Timeline of Observations
| Date (occurred) | Event |
|---|---|
| July 6 2025 | An adult female, nicknamed “Stevie Nicks,” maneuvered a bailer shell (*Melo amphora*) at the surface before dropping it. |
| October 1 2025 | Mother dolphin “Maserati” surfaced with a shell containing a fish; minutes later her calf “Bentley” picked up the same shell and mimicked the motion. |
| August 8 2026 | The team published their findings in *Marine Mammal Science*, presenting the first potential evidence of maternal transmission of shelling. |
Data & Statistics
- Species: Indo-Pacific bottlenose dolphin (*Tursiops aduncus*).
- Location: Hervey Bay, Great Sandy Marine Park (Queensland) – the second global site after Shark Bay.
- Shell type: Large empty bailer shell (*Melo amphora*), football-sized.
- Documented events: Two shelling incidents in 2025, plus archival photographs from 2013 and 2019 supplied by local whale-watching operators.
Official Statements & Responses
Dr. Alexis Levengood, behavioral ecologist at the University of the Sunshine Coast, described the July 6 sighting as an unexpected “shelling” moment that sparked immediate excitement. She noted that “all it takes is one dolphin doing something clever that is easily learnable for it to spread.” Regarding the October 1 event, Levengood said the mother’s action was followed within minutes by her calf’s identical handling, indicating a possible vertical learning pathway. The team plans further fieldwork in Queensland and Shark Bay to clarify how the behavior spreads.
Verbatim Quotes
- “We were on a research boat off Hervey Bay when we spotted a dolphin raising something large out of the water. I started screaming because I know what shelling looks like,” — Dr. Alexis Levengood
- “Our footage challenges the belief that dolphins learn this tool strictly from their peers,” — Dr. Levengood
Why It Matters
The Queensland observations expand the known range of dolphin tool use and provide visual evidence that a mother may directly teach the technique to her calf. This challenges the earlier view that shelling is acquired solely through peer observation and suggests multiple cultural transmission routes—horizontal and vertical—within dolphin societies. Understanding these learning mechanisms offers insight into cetacean cognition and the evolution of animal culture.
Conflicting Reports & Gaps
All sources agree on the core facts of the two 2025 sightings and the 2026 publication. However, the prevalence of shelling across other Australian dolphin populations remains uncertain; older photographs hint at earlier occurrences, but systematic surveys are lacking. Researchers call for expanded monitoring to determine how widespread shelling is and to identify additional pathways of cultural transmission.
