Wonderful Impressions of diving with dolphins - 8K [Ultra HD]

Wonderful Impressions of diving with dolphins - 8K [Ultra HD]

Dolphins are mammals, not fish. They belong to the order of whales, there to the suborder of toothed whales and to the family of dolphins. Their ancestors were terrestrial mammals that transitioned back to aquatic life millions of years ago.

Dolphins have a streamlined body, making them perfect swimmers. Depending on the species, they are between 1.5 and four meters long. The largest dolphins, the killer whales, even reach a length of eight to nine meters.

They have a round, hump-like bulge on their heads: the melon. This is a special organ that allows the dolphins to orient themselves with the help of echo sounds. The blowhole through which the animals breathe is located on top of the head.

Depending on the species, dolphins are colored in different shades of gray. The upper side is usually darker than the ventral side. Dolphins have a relatively large brain, which is why they are considered among the most intelligent animals. Their sense of hearing and smell is very well developed.

Bottlenose dolphins are one of the best-known species of dolphins. They are two to four meters long and weigh 150 to 200 kilograms. They are dark gray on the back, slightly lighter on the flanks and almost white on the belly. Her seemingly "smiling" facial expression is typical.

River dolphins form a super family of their own. They differ greatly from the real dolphins in some characteristics. For example, they can only see very poorly. But they can orientate themselves even better with their echolocation system. In addition, the snout of all river dolphins is much longer than that of marine dolphins.

Dolphins are found in almost every sea in the world. However, the individual species have very different distribution areas. Some live in large marine regions, others, such as the dusky dolphin, only on the coasts of South America and South Africa.

The bottlenose dolphin is found worldwide in temperate and tropical seas, and also in inland seas such as the Mediterranean and Black Seas. The river dolphins are an exception: they only live in rivers.

The life expectancy of the different dolphin species varies. It is not known for many species. It is known that bottlenose dolphins can get quite old: the animals reach an age of around 37 years.

Dolphins are very social animals. They live together in groups called schools. That can be 100 animals and more.

When dolphins are playing or being chased, they swim at 25 kilometers per hour. In extreme cases, they are 80 to 90 kilometers per hour. They often jump out of the water or follow ships to ride their bow waves.

Dolphins are also very good at diving: when hunting, they dive up to 300 meters deep and can stay underwater for 15 minutes. Some species can dive to depths of 600 meters. However, because they are mammals, they need to come to the surface of the water regularly to breathe.

Dolphins have an echolocation system that they use to emit ultrasonic sounds. These clicks are echoed by obstacles in the water, such as prey fish, and picked up again by the dolphins. From the type of echo, the animals can tell exactly whether there are prey or obstacles in the water.

Dolphins can fall prey to the killer whale, one of their relatives. But animals of the same species can also become dangerous: if dolphins meet strangers who do not belong to their group and who they do not know, they drive them away or even attack them.

Dolphins are skilled, fast hunters. When hunting for fish or squid, they often hunt together, with a whole pod of dolphins circling a school or drifting ashore. They track down their prey with the help of their echolocation system.

Dolphins use whistles, chatter, and other sounds to communicate with each other. They also use special click sounds. These sounds can hardly be heard by humans.

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