Coin The Black Sea bottlenose dolphin
|Artist||E. V. Kramskaya|
|Sculptor||N. A. Nosov|
|Period||Bank of Russia (1992-1996)|
|Release date||November 9, 1993|
|Weight||6.25 г .|
|Diameter||25 мм .|
|Thickness||1.75 мм .|
|Metal||Bi-metal (Ring - a copper-nickel alloy, disc - aluminum bronze)|
|Edge||Ribbed (interrupted corrugation with a pitch of 3 mm)|
The smiling muzzle dolphin familiar to us from childhood - the brightest friendly animals perfectly trainable, scientists and zoologists working with them, about them make films and write books. For charming "smile" and cheerful nature of dolphins love kids, wonder of their abilities and acumen adults... There are cases when dolphins rescuing drowning people or protect swimmers from sharks by surrounding a dense ring of people and not allowing the predator to attack. And how sad and terrible are the words that among these funny and cute animals there are endangered species. One of them - the Black Sea bottlenose dolphin.
This subspecies inhabits only in the Black Sea, where, in fact, came the name - the Black Sea bottlenose dolphin. Bottlenose Dolphin - the largest representative of the family of dolphins; bottlenose length sometimes reaches three-meter mark, and weighing more than 200 kg. Top dolphin dark brown (appears black in the water this color), the lower part of the snout and the belly is usually white or light gray. bottlenose dolphin's body vaguely and perfectly adapted to aquatic life.
Particularly noteworthy dolphin teeth, their size is not constant, and the upper jaw may contain from 19 to 28, and the bottom - from 19 to 25 pairs of teeth, strong, durable, up to 3 cm in length. Such teeth are necessary for the bottlenose dolphin hunting for fish because dolphin diet consists of all its species: anchovies, snapper, flounder, haddock, mackerel... Afalina not averse to eat a shrimp, and octopus, and sometimes can eat even a small shark. Finds the food Dolphins in the water, sometimes at the bottom, diving to a depth of 170 meters and holding your breath for 10-15 minutes. However, dolphins are not fish: zoologists refer them to the order Cetacea, which means that bottlenose dolphin - the mammal. It is true: a small dolphin feeding mother's milk for six months, and even after he learns to fend for themselves on their own, continuing to feed the child a few months.
Dolphins surprisingly well developed parental instincts. A baby just born, does not have enough stamina to emerge and take the first breath. Delfinёnok born tail first, and as soon as the umbilical cord is cut off, several females, led by his mother to help the baby to climb to the surface. For a long time the baby dolphin is kept close to the mother, and only after 4 weeks smeleet and begins to explore the world.
Dolphins Speed develop rather big, it is comparable to a good car - up to 70 kilometers per hour. In this they are helped by fins, rudders and powerful tail, which is responsible for the speed of a dolphin helps to stick to the right direction, and serves as the main body of the motor; it is blagodayar animal swims so fast.
The Black Sea bottlenose dolphin is considered a rare species with a decreasing population, but this matter is not only prohibited in our time hunting for an exquisite meat. Dolphins are dying, getting tangled in fishing nets; uncontrolled fishing also causes irreparable harm to the population of bottlenose dolphins, as it deprives animals of their main food. Caught in an oil tanker accident - a real disaster for the dolphins. Bottlenose dolphins, however, like other cetaceans, suffocating under the oil film and die.
Separately should be said about the noise pollution. Motor boats, sonar, ships with engines interfere with the communication between individuals, difficult orientation in space, and the bombings produced in geological surveys and seismic research, lead to mass death of dolphins. Therefore, the preservation of these beautiful and friendly animals should include not only measures taken in relation to the poachers, but also a complete overhaul of the human relationship to the planet as a whole.
In the center - the Emblem of the Bank of Russia (the two headed eagle designed by I. Bilibin), underneath the right - the mint mark, the inscriptions along the rim: at the top - "50 РУБЛЕЙ 1993 г." at the bottom - "БАНК РОССИИ".
Image of Black Sea bottlenose dolphins on a background of a sea wave, inscriptions along the rim separated by two dots: at the top - the "КРАСНАЯ КНИГА", at the bottom - "ЧЕРНОМОРСКАЯ АФАЛИНА".