Delphinidae are the greatest representatives of group of mammals, families of cetacea. Mammals are warm-blooded beings who can live practically in all conditions. Most often dolphins lead a group life.
Instruction
1. From time immemorial between dolphins and people there were good, kind and sincere relations. The marine animals never giving an occasion to doubt their excellent friendliness, loyalty and sympathy were initiators of such situation. History does not know cases that these beautiful, graceful and prompt inhabitants of the World Ocean attacked people. But there are many stories about how dolphins saved drowning, helping them to reach sushi. Dolphins perfectly feel in sea water. Their body is specially created for life in the sea, it has a streamline shape and the flattened tail. In a mouth at a dolphin of 210 teeth, but at the same time he swallows of food pieces, without chewing. Dolphins have lungs, and here gills as at fishes, at them is not present. The brain of a dolphin, weighs almost as much how many a brain of the person. The dolphin has a four-chamber heart. These marine animals are capable to distinguish tastes: sweet, bitter and salty.
2. There live dolphins big collectives – packs. In pack all animals are connected by related bonds. Here is not present alien and others. These strong communities, conjoint and amicable, they never break up and there are, probably, hundreds of years. The skilled, lived male is at the head of such pack. But at some types all on the contrary: the head to all the mature female, males are playing a supporting role. Pregnancy term at females lasts 12-16 months (depending on a look). The cub is born one and large sizes (50-60 cm). Mother brings up its milk 6-8 months. Dolphins very slowly, the relation to young growth grow in pack trembling and gentle. The cub is strongly attached to mother, follows her everywhere. Only having reached two-year age, the young dolphin begins to adapt to independent life. Eat mainly fish and squids though some types prefer shrimps and other Crustacea, and killer whales eat also sea turtles, water mammals and birds. Average life expectancy of these mammal 50 years. They live in bondage twice less.
3. Mass trade hunting for dolphins, deprivation of their freedom, commercial use of these surprising animals in dolphinariums – do not do credit to a nature wreath. Long ago it is known that communication with dolphins well affects a physical and emotional condition of the person. Researches showed that dolphins are capable to give positive power. Despite a separate negative, dolphins surprising animals. You begin to experience admiration and delight, looking at their graceful bodies, gracefully and promptly sliding on a sea surface. The lack of fear of people and readiness cause to come to the rescue involuntary respect. Kindness and sociability provoke reciprocal kindness, and in the head the seditious thought begins to creep in that if the dolphin, but not the person was the tsar of the nature, then life on the earth could be happy and cloudless on the present.