Task 2:

1, Dolphins are not fish. They are mammals that live in the water.

2, Dolphins are among the most intelligent animals on Earth.

3, Although they can find all oceans in the world, dolphins prefer coastal waters and bays.

4, Size of dolphins varies greatly. Smallest dolphin is just 50 kg in weight and 1.2 m in length, the largest one can weigh up to 8,200 kg and is 10 m long.

5, Dolphins are carnivores as they eat fish. Female dolphin gives birth to one calf every 2 years after a gestation period of eleven to twelve months.

6, A dolphin can normally live twenty-five or sixty-five years, some species of dolphins can even live longer.

7, Dolphin populations are at risk due to pollution and their habitat becomes accidental entrapment in fishing net.