Humpback Whales Wield and Manufacture Their Own Tools
Aug 21, 2024 by News Staff
Humpback whales (Megaptera novaeangliae) create the so-called ‘bubble-net tools’ to hunt, but researchers from the University of Hawai’i and the Alaska Whale Foundation have learned that these marine animals don’t just create the bubble-nets; they manipulate this unique tool in a variety of ways to maximize their food intake in Alaskan feeding grounds. This novel research demystifies a behavior key to the whales’ survival and offers a compelling case for including humpbacks among the rare animals that manufacture and wield their own tools.
Several animal species use tools for foraging; however, very few manufacture and/or modify those tools. Humpback whales, which manufacture bubble-net tools while foraging, are among these rare species. Using animal-borne tag and unoccupied aerial system technologies, Szabo et al. examine bubble-nets manufactured by solitary humpback whales (Megaptera novaeangliae) in Southeast Alaska while feeding on krill. They demonstrate that the nets consist of internally tangential rings and suggest that whales actively control the number of rings in a net, net size and depth and the horizontal spacing between neighboring bubbles. They argue that whales regulate these net structural elements to increase per-lunge prey intake by, on average, sevenfold. Image credit: Szabo et al., doi: 10.1098/rsos.240328.
“Many animals use tools to help them find food, but very few actually create or modify these tools themselves,” said University of Hawai’i Professor Lars Bejder.
“We discovered that solitary humpback whales in SE Alaska craft complex bubble nets to catch krill.”
“These whales skillfully blow bubbles in patterns that form nets with internal rings, actively controlling details like the number of rings, the size and depth of the net, and the spacing between bubbles.”
“This method lets them capture up to seven times more prey in a single feeding dive without using extra energy.”
“This impressive behavior places humpback whales among the rare group of animals that both make and use their own tools for hunting.”
More:
https://www.sci.news/biology/humpback-whale-wield-manufacture-tools-13194.html