Delfiner: fakta, kommunikation og socialt liv

Hallo.

I have about dolphins.

I hope you like my project.

Indhold:

Today I will tell about:

General facts

Sound and communication

The Social life

Anatomy

Senses

And in the end, I will show you a little movie with dolphins.

General facts:

Dolphins are ocean mammal. They are relation for whales and porpoise and they are famous for their intelligence and happiness.

The name “dolphins” come from the ancient in Greek.

An average dolphin will be approximately twenty to twenty-five years old.

The maximum age for a dolphin is forty years old.

The maximum speed is approximately fifty to fifty-five kilometres per hour. And at the high speed do the dolphins jump up by the air and like this, they save energy.

Dolphins stay rare themselves deep down in the watery, but they can dive down to big depths. Some reports mention dive nearly one thousand metre.

Dolphins are pregnant in approximately three-hundred and thirty days.

Sound and communication:

Dolphins communicate with each other by means of sounds. The sound is about croak, barking or crackle.

(tryk på billedet, for at afspille lyden af en delfin)

In addition to the mentioned sounds, the dolphin uses also themselves to splash in the water.For example they jump up by the air and fall down with a splash. The movement of the back fin or a blow on the surface of water makes also a sound.Besides dolphins can of various sorts communicate and even give each other company. Sonar:When the dolphin is hungry it uses a special technique to find the food.(vis bevægelser)It sends out a highfrekvent sound and if the sound hits an object it will be reflected back so that the dolphin knows where it is. (Stop bevægelser)(lad billedet køre I baggrunden)If the object is a fish, the food has been found. You can compare the technique with a radar on a ship. The dolphins can actually paralyze their prey. (Tryk for at få billedet væk) The sound of the Sonar is like that: (tryk på billedet, for at afspille lyden af sonaren)