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Could otters who juggle rocks be hungry and excited to eat?

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Zoo otters juggle stones when they are hungry because they may be excited about food, scientists believe. The mammals can often be seen playfully tossing rocks in the air while standing or lying on their backs. Scientists from the University of Exeter who conducted the study believe this behaviour might help juvenile otters practise the foraging skills they need to extract foods from complex prey such as mussels and clams. Credit: Exeter University

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