Dolphins are the best. They are also very friendly and playful. They knever harm anyone.

Dolphins are widespread. Most species prefer the warm waters of the tropic zones, but some, such as the right whale dolphin, prefer colder climates.

Dolphins may swim through the water as gracefully as any fish,  but they are not fish; they are mammals. 

Some species of dolphins are endangered! Some dolphins are plentiful in number, like the bottlenose. Other species are endangered and are getting close to extinction. The most endangered dolphins are Maui's dolphin, Hector's dolphin, Indus and Ganges river dolphins ect.

Even though dolphins are friendly, you can not pet them. Some are friendly and curious and others are skittish and and avoid human contact.

People are contaminating the water! Many marine animals are also endangered. If we just dont litter and dirty water bodies then many lives of marine animals can be saved. It is easy to not litter. If we stop littering, others will also follow. Little things can change the world.