Category 1: Physical Features & Movement, Dolphins move their tails up and down to propel themselves forward., They lack gills and must surface to take in air through their blowholes., Pectoral fins are used on either side of the chest to help steer through the water., Category 2: Social Structure & Cooperation, Injured dolphins are supported by group members so they can reach the surface to breathe., Members of a pod work collaboratively to hunt for food., Category 3: Communication & Echolocation, Dolphins bounce sound waves off objects to pinpoint their location underwater., Every dolphin has a unique signature whistle that functions like a personal name., Dolphins display regional accents depending on their place of origin.

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