character: Dolphin
topic: Echolocation in Aquatic Environments
subject: Geography
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character: Orca
topic: Communication and Hunting Techniques in Oceans
subject: Geography
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character: Nautilus
topic: Underwater Navigation and Sensory Adaptations
subject: Geography
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character: Bottlenose Dolphin
topic: Social Structures and Echolocation Efficiency
subject: Geography
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