Dolphin Hunting Techniques in Australia
In Australia, some dolphins have developed unique methods for foraging fish from the seabed. They use sponges on their beaks, resembling a clown’s nose, to help them hunt.
By placing a sponge over their beaks, these dolphins can safely search for food without damaging themselves on sharp rocks. They swim over the sandy channels, sifting through the substrate to uncover hidden fish like the barred sandperch.
A recent study published in the Journal Royal Society Open Science reveals that this fascinating behavior is not only passed down through generations but is also more complex than it initially appears.
Using a sponge during the hunt poses challenges, as it interferes with the Bottlenose Dolphin’s highly sensitive echolocation. Co-author Ellen Rose Jacobs, a marine biologist from Alfs University in Denmark, noted, “It might look a bit strange, but dolphins learn to adapt.” She used underwater microphones to analyze how the sponge affected sound waves during echolocation.
Researchers highlight that sponge hunting is an effective strategy for catching fish, with sponge sizes varying from softballs to melons.
Mauricio Cantor, a marine biologist at Oregon State University, likened this method to hunting while blindfolded, emphasizing that it requires a high level of skill and training.
Perhaps understandably, this behavior is relatively rare; only about 5% of the dolphin population in Shark Bay exhibits this technique, equating to roughly 30 dolphins, according to Jacobs.
Jacobs also pointed out that mastering this specialized hunting skill takes years. Not every dolphin will learn it. Boriswarm, a marine ecologist at Dalhousie University in Canada, mentioned that dolphin calves typically stay with their mothers for three to four years, observing and absorbing crucial survival skills.
The intricate practice of sponge hunting is essentially passed from mother to offspring, as explained by co-author Janet Mann, a marine biologist from Georgetown. It’s quite remarkable how this knowledge transfers within their social structures.
