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And, the birds selectively targeted their gelatinous meals.
The penguins could be seen hunting carnivorous species, including different kinds of 'true' jellyfish (Cnidaria) and 'comb jellies' (Ctenophora), and opting not to pursue plant-eating gelata species known as salps, which get their energy from the light.
This included Adélie penguins (Pygoscelis adeliae), yellow-eyed penguins (Megadyptes antipodes), Magellanic penguins (Spheniscus magellanicus), and little penguins (Eudyptula minor), for a total of 106 individuals.
The team fitted the penguins with thumbdrive-sized video recorders, tracking the birds at seven breeding sites in the southern oceans – or, oceans south of 30 degrees S latitude. In the extensive footage, the researchers spotted nearly 200 instances of penguins attacking the gelatinous ocean creatures, dubbed 'gelata.'While other large animals, such as sea turtles and ocean sunfish, are known to thrive on a diet of jellies, the researchers say this is surprising behaviour for penguins, who are warm-blooded animals with high energetic demands.'It is hard to believe that penguins, which are endothermic animals and thus need fair amounts of energy from their food to keep their bodies warm, could find any benefit in eating relatively energy-poor prey like jellyfish, especially in freezing Antarctic waters,' Jean-Baptiste Thiebot, a postdoctoral fellow with Japan's National Institute of Polar Research and lead author on the study, told National Geographic.'Crustaceans, and more so fish, contain much more energy per gram, [and] seem much more adequate to satisfy the energy demand of penguins.'This especially applies for those raising chicks, the researcher noted.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.
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