This might be a bit surprising for many, but dolphins are carnivorous. Their diet is made up of fishes and squids found in the ocean. They are extremely social beings found in groups or 'schools' of 10-50 or even 100-2,000.
The members of the groups are often engaged in activities like jumping around and splashing in the water. Bow-riding and chin-slapping are common among dolphins. These playful activities make them the favorites among seafarers.
While only five species of dolphins live in freshwater rivers, the rest inhabit tropical and temperate oceans. Some species prefer to migrate to warmer waters when it gets too cold. Travelling in groups is common in dolphins.
Dolphins mate throughout the year. The gestation period varies between 9-17 months as per the species of the mammal concerned. A single calf is born at a time. It is nursed by the mother for 11-24 months. The calf is not expected to leave its mother before it is 3-8 years old.
Dolphins are known to live for a long time. Some species of dolphins are known to live for 70-80 years. They are quite similar to bats in using the technique of echolocation in getting around places and even hunting. They have an excellent sense of hearing which compensates for their poor eyesight.
Dolphins are one of the fastest swimming beings on earth. They are known to acquire speeds of 40 km per hour. They employ their speed as well as group-behavior to get hold of their prey. Their body shape is aligned for the purpose of swimming fast.