Here's why:
* Food Availability: Oceans and seas offer an abundance of food for dolphins, including fish, squid, and shrimp. Their streamlined bodies and echolocation abilities make them efficient hunters in these environments.
* Warm Water Temperatures: Most dolphin species prefer warmer waters, which are found in tropical and subtropical regions. These waters provide a suitable environment for their bodies to function optimally.
* Saltwater Tolerance: Dolphins are saltwater animals, and their bodies are adapted to live in these conditions. They have special kidneys that allow them to regulate salt levels in their blood.
* Open Water for Movement: Oceans and seas provide large open areas for dolphins to travel and hunt. Their ability to swim long distances allows them to cover large areas in search of food.
* Protection from Predators: While dolphins are apex predators, they still have predators such as sharks and killer whales. Open oceans offer some protection from these threats.
River Dolphins:
There are a few species of dolphins that live in freshwater rivers, such as the Amazon River dolphin and the Ganges River dolphin. These dolphins are adapted to live in these environments, with features like smaller bodies and the ability to navigate murky waters. They primarily prey on fish found in these rivers.
Important Note:
The specific habitats of different dolphin species vary depending on their individual needs and adaptations. Some species may prefer coastal areas, while others prefer deeper waters.