Wanderlust World Wanderlust World Dolphins are marine mammals that spend the majority of their lives near the ocean's surface. Because they breathe air through a blowhole, they must return to the surface regularly to take a breath—typically every few minutes, though they can hold their breath longer during deep dives.
Most dolphin species favor shallow, coastal waters where food is abundant and protection from large predators like sharks is easier to find. These nearshore environments—bays, estuaries, and continental shelves—offer rich hunting grounds for fish, squid, and crustaceans.
While they are not considered deep-sea dwellers, some species (such as the Risso's dolphin or pilot whale) can dive to impressive depths of 1,000 feet or more in search of prey. However, these forays are temporary; the animals always return to the upper water column to breathe, socialize, and rest.
In short, dolphins are surface-oriented creatures that rely on the sunlit zone of the ocean for survival, making the "middle" or deep parts of the ocean only a brief destination, not a permanent home.