dolphins

dolphins

Dolphins or dolphins are cetaceans animals belonging to the family Delphinidae. They are perfectly adapted to live in the aquatic environment, and there are 37 known species of dolphins in the salt water and fresh water. The most common species is the Delphinus Delphinus.

Are privileged swimmers sometimes jump up to five meters above the water, they can swim at a speed of up to 40 km / h and dive to great depths. Their food consists mainly of fish and squid. They can live 20-35 years and give birth to a cub at a time. They live in groups, are social animals, both between them and with other animals and humans.

His great intelligence is the subject of many studies by scientists. In captivity you can train them to perform variety of tasks, some of great complexity. They are extremely playful, because no animal except man, has such a wide range of behaviors that are not directly related to basic biological activities such as feeding and reproduction. They have the extraordinary sense of echolocation or biossonar or orientation echo, which they use to swim through obstacles or to hunt their prey.

predators

Predators of the dolphins are whales, large sharks and mostly the man. Tuna fishermen, often look for dolphins, which also hunt, when it occurs protocoperação. The dolphin is the shoal and fishermen throw nets trapping the fish and let the dolphins feed and then pull the nets. Thus, both species benefit from food. But often the dolphins end up screwing the networks and may die.

The length of the nets, as well as necessary, as well as pollution also increase predation.

feeding

Dolphins are hunters and feed mainly on fish. Many of them hunt in groups and look for large schools of fish. Each species of fish has an annual cycle of movements, and the dolphins follow these shoals and sometimes seem to know where to intercept them, probably they get this information by fish excretions chemical, present in urine and faeces.

Sleep

Dolphins are mammals and by presenting pulmonary respiration must constantly perform hematosis from the oxygen in the atmosphere, this fact forces the dolphins and many other aquatic animals with pulmonary respiration to rise constantly to the surface. One consequence of this condition is sleep based on the principle of alternation of the cerebral hemispheres in which only one brain hemisphere becomes unconscious while the other hemisphere remains conscious, enabling to obtain oxygen from the surface.