Mesmerising photos capturing native Australian dolphins donning sea sponges and other stunning headwear have been shared showing an ultra-rare marine courtship act rarely seen by people.
The shots, which recently resurfaced online and sparked a wave of fascination, were captured a few years ago in the Dampier Archipelago’s Flying Foam Passage, off Western Australia’s rugged Burrup Peninsula, by scientists from the Department of Biodiversity, Conservation and Attractions (DBCA).
The images show male dolphins engaging in an extraordinary and rarely seen courtship ritual – collecting and presenting sea sponges to potential mates, almost like romantic gifts. In some cases, they even balance the sponges on their heads or snouts.
for Senior Research Scientist Holly Raudino, from DBCA’s Marine Science Program, the renewed attention has been a welcome reminder of just how special and fragile this little-known species is.
The incredible images were taken in the Dampier Archipelago in the Flying Foam Passage, between Angel Island and Dolphin Island. Source: WA Parks and Wildlife Service
“There’s renewed interest in the species because they’ve actually been uplisted to vulnerable under the EPBC Act,” dr Raudino told Yahoo News Australia. “People are concerned about their population status and them being threatened.”
The dolphins in the photos are Australian humpback dolphins (Sousa sahulensis), a species only formally described in 2014. They are found in coastal waters of northern australia and are known for their distinctive hump on their backs.
Dolphins Present Sponges as Gifts, Revealing vulnerable Status
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The mammals are known to present the sponges to prospective mates as ‘bouquets’. Source: WA Parks and Wildlife Service
Australian dolphins are displaying a surprising and endearing behavior: gifting sponges to potential mates. This unique courtship ritual has recently led to the species being officially listed as vulnerable, highlighting the need for increased conservation efforts.
A sponge as a bouquet
Researchers have observed male Indo-Pacific bottlenose dolphins foraging for sponges and then presenting them to females. This isn’t a random act; it’s a deliberate display, akin to offering flowers. “They’re essentially presenting a bouquet to a female,” explains Dr. Marianne Raudino, a marine biologist with the WA Parks and Wildlife Service. “It’s a really captivating behavior.”
The sponges, which are typically found on the seabed, aren’t eaten. Instead, females except or reject the offering, potentially assessing the male’s foraging skills and overall fitness. This behavior is especially prevalent in Shark Bay, Western Australia, and is considered a key part of their mating rituals.
More funding needed to help understand little-known species
Now, with the species officially listed as vulnerable, she’s calling for more funding to help researchers better understand and protect them. “We’d need to do a dedicated study,” she said. “we’d probably have to survey where the sponges are and look at how that overlaps with dolphin sightings. That would be a great project – we’d definitely need more funding to do that.”
Understanding these quirks of behavior, she said, is key to ensuring the species survives. “They’re endemic to Australia and were only fairly recently described – the taxonomy was only resolved about 10 years ago,” Dr Raudino said. “If we don’t look into it more, we don’t know what we’re losing.”
Dolphins’ astonishing knack for creativity
Dolphins are renowned for their problem-solving skills and complex social structures. This sponge-gifting behavior adds another layer to their already impressive intelligence. It demonstrates a capacity for learned behavior and cultural transmission, as the practice is passed down through generations. Researchers believe this unique tradition is a vital component of their social lives and reproductive success.