Possibly the most interesting and cute aquatic mammal is the Dolphin.The Dolphin is a mammal with close association to the whale and porpoise. There are at least thirty seven species of dolphins in the world. The name ‘Dolphin’ may have come from the ancient Greek term ‘Delphis’,which means’with a womb’. Therefore, the meaning of the word ‘Dolphin’may mean ‘fish with a womb’. There are thirty two species of ocean dolphins and five species of river dolphins.
Dolphins are mammals. As all mammals, dolphins nurse their young from mammary glands.
Dolphins live in families? These families are usually led by a female dolphin. The dolphins in a family help each other, for example when raising their young. When travelling or hunting, several families might join together to make a larger group, a school of dolphins.
The largest dolphin is the orca? It can reach up to ten metres in length.
The botllenose dolphin brain weighs 1500-1600 grams. While average human brain weighs 1200-1300 grs. This is not a conclusive evidence of dolphin intelligence as many other factors might be the cause of intelligence according to scientists.
Dolphins have a thick layer of fat beneath their skin? This layer of fat is called blubber. As dolphins have no fur, they need the blubber to keep warm. Dolphins in colder waters usually have a thicker layer of fat than dolphins in warm waters.
Dolphins are endangered? Humans are the greatest threat to dolphins: environmental pollution, habitat destruction and overfishing are the main reasons why so many dolphin species are endangered. Lots of dolphins get stuck in fishing nets and in some countries, dolphins are deliberately killed because they eat the fish that the fishermen want to catch. If we do not do anything about it, dolphins might soon be extinct.
Dolphins communicate efficiently. Dolphins can make a unique signature whistle that may help individual dolphins recognize each other, collaborate and perform several other kinds of communication.
Not all dolphins live in seawater? There are some species that live in fresh water: the river dolphins. Unfortunately, river dolphins are critically endangered and it is even feared that one species, the baiji, has already died out.
Dolphins can swim 5 to 12 kilometers per hour. This will depend on the species and situation, although fastest dolphins can reach up to 32 km/h.