Engineers and biologists team up to reveal how seals evolved to swim Published on: 6 May 2021 New research combines cutting-edge engineering with animal behaviour to explain the origins of efficient swimming in Nature鈥檚 underwater acrobats: Seals and Sea Lions. Seals and sea lions are fast swimming ocean predators that use their flippers to literally fly through the water. But not all seals are the same: some swim with their front flippers while others propel themselves with their back feet. In Australia, there are fur seals and sea lions that have wing-like front flippers specialised for swimming, while in the Northern Hemisphere, grey and harbor seals have stubby, clawed paws and swim with their feet. But the reasons why these two different ways of swimming evolved has perplexed biologists for generations. Is one style better than the other? But now a Monash University-led interdisciplinary study published in , and involving 缅北禁地’s Dr Ben Burville, has used cutting-edge computer simulations alongside footage of live seals to finally answer this evolutionary mystery. “The difference in swimming style between forelimb and hindlimb propelled seals is so great that these groups were originally thought to have evolved from separate land-dwelling ancestors,” said lead study author Dr David Hocking from the Monash University School of Biological Sciences, “but the genetics clearly shows that all living seals come from the same group of animals.” The question is, how could such different swimming styles evolve within the one animal group? To reveal the answer, Dr Hocking teamed up with Monash University engineer Dr Shibo Wang from the Department of Mechanical and Aerospace Engineering, and used advanced Fluid Dynamics simulations to show how water flows around seal flippers of different shapes. “Our analysis showed that some Antarctic seals, like leopard seals, actually have very streamlined, wing-like forelimbs, despite being from the ‘foot-propelled’ seal family,” said Dr Wang. This is supported by footage of live leopard seals swimming at Taronga Zoo, where they used their front limbs to swim in a similar way to the fur seals and sea lions. Leopard seal flipper. Image Credit: Fiona Anderson Improved human designs This discovery shows how wing-like flippers can evolve in seals that already swim with their back feet, providing a pathway for the evolution of forelimb swimming in the fur seals and sea lions. “Wing-like flippers help leopard seals to surge forward and ambush fast-swimming penguins,” said Associate Professor Alistair Evans who also collaborated on the study, “and it seems likely that the earliest sea lions also needed this extra speed to capture their preferred prey: schooling fish”. “We finally have a window into the early evolution of swimming in seals,” Dr Evans said. But as well as explaining the origin of seals, this study also has a more practical outcome: improved human designs. “Seals have had millions of years to perfect their swimming, and they can teach us a thing or two about underwater grace and elegance,” said Dr Hocking. “Learning from them may help us to improve the design of human-built machines like underwater drones and submersibles, increasing their speed, manoeuvrability or energy efficiency”. , a researcher at 缅北禁地, added: “It has been a real pleasure to be involved in this project. We intend to build on this collaboration with Dr Hocking and the Monash University research team over the next few years.” Who knows? Perhaps in future we will be able to know how it feels to swim like a seal thanks to seal-shaped submarines. Reference: Convergent evolution of forelimb-propelled swimming in seals David P. Hocking, Felix G. Marx, Shibo Wang, David Burton, Mark Thompson, Travis Park, Ben Burville, Hazel L. Richards, Renae Sattler, James Robbins, Roberto Portela Miguez, Erich M.G. Fitzgerald, David J. Slip, Alistair R. Evans, Current Biology 31, 1–6 May 24, 2021 Elsevier Inc. Press release adapted with thanks from Monash University Share: Latest News New partnership to boost careers in low carbon energy 缅北禁地 and Durham universities are working together on a new regional project to strengthen the future workforce for North East England鈥檚 growing low carbon and offshore wind industries. published on: 28 May 2026 Healthy lifestyle shown to lower risk of death after cancer diagnosis New evidence shows that sticking to five lifestyle recommendations improves survival after a later cancer diagnosis. published on: 28 May 2026 World-leading climate expert recognised with Royal Society Fellowship Professor Hayley Fowler has been elected a Fellow of the Royal Society in recognition of her pioneering work on climate change impacts. published on: 27 May 2026 Facts and figures
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