Dolphins live in pods, or groups, that can range in size from a few individuals to over a hundred. The size of a pod can vary depending on the species of dolphin, the environment, and the availability of food.
Habitat
Dolphins are found in all oceans of the world, but they are most commonly found in tropical and subtropical waters. They prefer warm, shallow waters near coasts and estuaries, but some species, such as the bottlenose dolphin, can also be found in open ocean waters.
Home Range
Dolphins have a home range, or an area that they regularly use for feeding, breeding, and socializing. The size of a home range can vary depending on the species of dolphin, the environment, and the availability of food. Some dolphins may have a home range that covers hundreds of square kilometers, while others may have a home range that is only a few square kilometers.
Nest
Dolphins do not build nests, but they do have preferred resting areas. These resting areas may be located in shallow waters near the shore, or in deeper waters further out to sea. Dolphins may also use caves, coral reefs, or other natural structures as resting areas.
Breeding
Dolphins breed in the warm waters of the tropics and subtropics. Females typically give birth to a single calf after a gestation period of approximately 12 months. The calf is born tail-first and is immediately able to swim. Dolphins are very social animals and calves are raised by their mothers and other members of the pod.
Migration
Some species of dolphins migrate long distances to find food and breeding grounds. These migrations can cover hundreds or even thousands of kilometers. Other dolphins are more sedentary and remain in the same area throughout the year.