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Seals and sea lions undergo hearing tests in Australian research
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Seals and sea lions undergo hearing tests in Australian research

At Sydney’s Taronga Zoo, two sea lions and two fur seals have learned to take hearing tests by pressing a paddle when they hear a tone - and earning fish for correct answers. I find it fascinating that researchers identified 3.2 kilohertz as the frequency they hear most sensitively. This gives scientists a useful starting point for understanding how noise from ships, aircraft and coastal construction may affect marine mammals, especially endangered Australian sea lions, whose population is estimated at just 12,000. Next, the team plans to study how underwater noise influences the animals’ hearing and behaviour, helping inform environmental assessments and noise controls.
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