Dolphins live in all oceans of the planet and even in some important rivers.

While not all species of dolphins live everywhere, there is a species for each environment. Specifically one of the best-known species, the bottlenose dolphin lives in every ocean of the world except the Arctic and the Antarctic oceans.

The Atlantic spotted dolphin, lives all over the tropical and temperate areas of the Atlantic Ocean avoiding the Artic and Antarctic regions.

The Pink Dolphin lives in the Amazon river.

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Most dolphins live in the ocean, but there are some species which live in freshwater rivers.

While most known species like the bottlenose and the spinner dolphins live in the sea, some other live in some of the most famous rivers in the world like the Amazon river, the Ganges River, the Yangtze River, the La Plata River and the Indus River.

The best known of all the freshwater species is the Amazon Pink Dolphin, also known as “Boto” who lives in the Amazon river.

Different species of dolphins live in the diverse climates that exist in the world.

From the cold waters of the north pole where some populations of killer whales dwell to the tropical waters of the Caribbean where the bottlenose dolphin live.

Even more, some dolphin species live in the tropical temperatures of rivers like the Amazon or Orinoco.

Dolphins are important to the environment because they can be good natural indicators of the biome conservation.

As they are apex predators, they consume several species of fish and squid concentrating in their bodies the possible contaminants in the water.

Therefore, monitoring dolphins and the levels of contaminants in their bodies help scientists to preserve the ocean.

Dolphins are important to the ecosystem in the sense that they are apex or top-level predators which control populations of fishes and squids and keep the balance of the ecosystem.

Lately, the bottlenose dolphins have been identified as sentinels of the coastal marine ecosystems, because they consume of a wide variety of fishes and squids, they absorb pollutants in their bodies when there are high concentrations of contaminants in the water so scientists can have an idea of the status of the marine environment.