Top Highlights
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Songs reveal hidden habitat: Recordings found Omura’s whale calls year-round off northern Australia, especially in warm waters and roughly 200 km offshore.
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A food-chain clue emerged: Whale calls were more likely about a month after algae levels rose—possibly because small prey need time to build up.
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They may feed without migrating: The findings suggest these whales could find regular meals in tropical waters, though researchers haven’t confirmed what they eat.
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Their habitat needs protection: Shipping and offshore industry can expose whales to persistent noise, which may disrupt communication and make them harder to study.
Listening where eyes cannot
Omura’s whales rarely appear in sightings, so researchers turned to sound. They searched recordings from 35 sites around Australia, gathered between 2005 and 2023. Software flagged the whales’ distinctive calls, and researchers checked each possible match.
The recordings captured calls in every month. They peaked from September through May, especially in warm waters. This gives scientists a practical way to track a hard-to-see species, even when boats cannot spot it.
A delayed clue from the food web
The strongest food clue appeared with a delay. Whale calls became more likely when satellite data showed higher algae levels about 30 days earlier. Algae do not feed these whales directly. Instead, small animals may eat the algae, then attract krill or other prey.
That pattern suggests Omura’s whales may find food in tropical waters throughout the year. It does not prove what they eat. Researchers also found more calls in waters warmer than about 81.5 degrees Fahrenheit (27.5 degrees Celsius), and roughly 124 miles (200 kilometers) offshore.
A useful map, with gaps
Sound recordings can help planners identify important whale habitat before they approve shipping routes or offshore projects. Reusing old recordings also makes the method practical. However, the network has gaps, and ship noise can shorten the distance over which researchers hear calls.
Songs cannot reveal how many whales live nearby, what they ate or whether females and calves also call. As ocean temperatures and food supplies shift, broader monitoring could show how their habitat changes. That knowledge can help people share tropical waters more carefully with wildlife.
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