Ответы и объяснения

2013-04-10T07:47:25+00:00

The majority of small tooth whales are called dolphins. They are mammals of the order Cetacea and the families Plantanistidae and Delphinidae and include about 50 species. All have a beak like snout and sharp, conical teeth.

Most dolphin species are about 6 ft in length, the males averaging 4 to 8 in longer than females. The largest is the killer whale, which can be 19-22ft long and weigh between 8000-10000lbs. One of the largest dolphins is the bottle-nose dolphin which can reach over 9ft in length and weigh 440 lbs. The smallest species is the buffeo, found in the Amazon River. The buffeo rarely grows over 3.9 ft in length and 66 lbs in weight, really smalled compared to the bottle_nose.

The body is sleek and smooth and the hairless skin is rubbery to the touch. Most species have jaws that protrude into a beak like snout. Above the upper jaw is a large mass of fat and oil-containing tissue forming the so-called "melon" that looks much like a bulging forehead.

Because dolphins are mammals, they must breathe air and maintain a high body temperature. The internal temperature, between 97.9 deg to 99 deg F, is acheived by a thick layer of blubber under the skin. Air is breathed through blowhole, situated almost directly on top of the head. The dolphin normally comes to the surface to breathe about every two minutes, and each breath consists of a short, almost explosive exhalation, followed by a slightly longer inhalation. Dolphins can hold their breath for up to several minutes and are capable of rapid and deep dives of more then 1,000 ft...

2013-04-10T07:50:27+00:00

Turtles belong to the most ancient group of animals - to reptiles (reptiles). Obviously, the nature created very practical form. Turtles existed many thousands years changing a little, and now look almost also, as well as in those days when they in an abundance wandered among dinosaurs. But for the last centuries number of some types reached a critical point.

Thousand sea turtles were processed in turtle soup, turtles of the Galapagossky archipelago whom seafarers took with themselves as "a live canned food" almost were completely destroyed, after all turtles are very hardy and can long do without food and water. Having come round, the mankind began to protect turtles, and some them them were included in the International Red Book.

The group of turtles includes a set of types, and they can be met in salty and fresh water, in the woods, in the high sea and even on the dry earth, is closer to deserts. At sea turtles in connection with constant life in water of a foot turned into flippers. Fresh-water turtles have an uploshchenny streamline armor, feet with long sharp claws for a production breaking, and between fingers they formed membranes. Overland turtles of usually powerful constitution, their thick feet have short stupid claws. Some water turtles again passed to life on a land, but don't break off communication with water.                                                                                      ПЕРЕВОД                                                                                                                Черепахи принадлежат к древнейшему отряду животных - рептилиям (пресмыкающимся). Очевидно, природа создала очень практичную форму. Черепахи просуществовали много тысяч лет мало изменяясь, и сейчас выглядят почти также, как и в те времена, когда они в обилии бродили среди динозавров. Но за последние века численность некоторых видов достигла критической отметки.

Тысячи морских черепах были переработаны в черепаший суп, почти полностью были уничтожены черепахи Галапагосского архипелага, которых мореплаватели брали с собой как "живые консервы", ведь черепахи очень выносливы и могут долго обходиться без пищи и воды. Опомнившись, человечество стало охранять черепах, а некоторые их них были занесены в Международную Красную Книгу.

Отряд черепах включает в себя множество видов, и их можно встретить в солёной и пресной воде, в лесах, в открытом море и даже на сухой земле, ближе к пустыням. У морских черепах в связи с постоянной жизнью в воде ноги превратились в ласты. Пресноводные черепахи имеют уплощенный обтекаемый панцирь, ноги с длинными острыми когтями для разрывания добычи, а между пальцами у них образовались перепонки. Сухопутные черепахи обычно мощного телосложения, их толстые ноги имеют короткие тупые когти. Некоторые водные черепахи вторично перешли к жизни на суше, но не порывают связь с водой.