Dolphins are among the most intelligent and amiable marine mammals, belonging to the suborder Odontoceti within the order Cetacea. They inhabit oceans worldwide and even some rivers, typically living in social groups with complex structures and sophisticated communication systems. Dolphins possess one of the highest brain-to-body mass ratios in the animal kingdom—second only to humans—and exhibit remarkable cognitive abilities. They use echolocation (biological sonar) to navigate, hunt, and even recognize themselves in mirrors, a rare sign of self-awareness. Their diet mainly consists of fish and squid, and they can swim at speeds of 30–40 km/h, often leaping and somersaulting above the water—a behavior thought to aid in communication and parasite removal. Dolphins are famously friendly toward humans, with numerous historical accounts of them rescuing swimmers or guiding ships. However, many dolphin populations are now threatened by ocean pollution, accidental entanglement in fishing nets, and habitat degradation. Protecting marine ecosystems, reducing plastic waste, and establishing marine protected areas are essential steps to safeguard these ‘ocean guardians.’
海豚是海洋哺乳动物中极具智慧与亲和力的代表，属于鲸目齿鲸亚目。它们广泛分布于全球各大洋及部分河流中，以群居生活为主，具有高度发达的社会结构和沟通能力。海豚的大脑与身体比例接近人类，在动物界中智力名列前茅。它们通过回声定位（即声呐）在水中导航、觅食，甚至能识别镜子中的自己，展现出自我意识。海豚通常以鱼类和乌贼为食，游泳速度可达每小时30至40公里，善于跃出水面、翻滚嬉戏，这种行为不仅用于交流，也可能有助于摆脱寄生虫。此外，海豚对人类表现出友好态度，历史上不乏救助落水者或引导船只的记录。然而，受海洋污染、渔网误捕及栖息地破坏等威胁，部分海豚种群正面临生存危机。保护海洋生态、减少塑料垃圾、设立海洋保护区，是守护这些“海洋精灵”的关键举措。
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