Рефераты. Mammals






p> A mother tiger usually gives birth to two, three, or four cubs at a time. This is necessary so that at least one of her cubs will survive. Many predators attack tiger cubs. To help keep them safe, the mother stays with her cubs for three or four years. During this time, the young tigers have a lot to learn from her if they are to hunt and survive on their own.

Animals, unlike man, must either capture prey, or, evade predators. In order for these animals, such as the tiger, to get close enough to its prey for the attack, these animals must be able to hide, or blend in with the background. That way the prey animal does not know that they are there…

The tiger uses what is known as disruptive camouflage, which means that instead of blending in with it's surroundings, the tiger uses it's stripes to break it's outline, or familiar shapes into smaller unfamiliar shapes.

Like all young animals, cubs are full of energy. They spend their days wrestling, chasing each other, and darting after butterflies. All this exercise helps prepare them for their first real hunt. And they are ready for this when they are about six months old.

It's hard to believe that in just six months, a playful little cub will be a ferocious hunter. By then, it will weigh almost 200 pounds (90 kilograms) and have four big canine teeth for attacking prey.

A female tiger is one of the most loving and caring mothers in the animal kingdom. She cuddles her babies to keep them warm. She feeds them and protects them from enemies. For three years or more she looks after them, teaching them how to hunt and survive in the wild.

This cub is only a few weeks old. In the wild, cubs are usually born in caves and other protected places. The mother keeps them there and brings them food for about three months. After that, the cubs are big enough to follow her as she hunts for prey.

The life of a baby tiger can be dangerous. If a mother leaves her cubs, even for a short time, they may be attacked by predators. Some of the animals that like to eat tiger cubs are leopards (left), pythons (below left), and hyenas (below right).

LEOPARDS

CLOUDED LEOPARD: PRECIOUS CARGO

One chapter in the Zoological Society's clouded leopard story began early in 1983 with the arrival of a young pair of cats from the People's
Republic of China. The cats were a welcome addition to the Society collection. Staff prepared a plan to encourage successful breeding, but unfortunately, tragedy occurred before the plan could be implemented.

In the exhibit, the female was accidentally exposed to a male, which severely mauled her right foreleg and shoulder. The injury was so severe that, because of the initial trauma and resulting fast-spreading infection, amputation of the leg and affected scapula were required to save her life.

The difficult surgery was masterfully conducted. Intensive care was required for more than two months. The veterinary staff and a hospital team kept the cat alive through repeated tube-feeding and frequent hands-on care, despite the cat's aggressive distrust of such treatment. Following many weeks of this regimen, the cat responded and made sufficient recovery to allow her return to the leopard exhibit.

A primary hurdle had been cleared -- the female had survived the injury. Next to be resolved were her adjustments to life on three legs and finding a method which would allow her reintroduction to the Chinese male.

First, the mammal staff placed the cat in a program designed to help her grow accustomed to life with three legs. After several months of satisfactory progress, the staff decided to place her with the male, who had been kept in a separate but adjoining room. The animals were allowed to make contact as they chose. To the relief of all, the reintroduction was successful. The cats proved to be compatible, and, shortly after reintroduction, breeding took place.

On the morning of April 25, 1984, final proof of the success of a long and difficult management program arrived-- a litter of two cubs. One cub did not survive, but the other was taken to the Children's Zoo to be raised by the nursery staff.

UNIQUE FELINE

The clouded Leopard has intrigued its public, been sought after for its fur, and mystified those who would try to categorize it. During the early morning hours of April 25, 1984, a discovery was made which was the culmination of a saga, which held elements of zoo diplomacy and goodwill, tragedy and suspense, cooperation and success. The discovery climaxed a chain of events surrounding this paradoxical cat.

This cat has behavioral and physical traits typical of the small cats, genus Felis, and the big cats, genus Panther. A paradox to taxonomists and zoologists, it has been assigned to its own genus, Necrfelis, and is considered a bridge between the two larger genera. A relationship to the extinct saber toothed cat has even been suggested, based on the physical characteristic of having, in proportion to body size, the longest canines of all living felines. Its canine structure is also similar to that of the saber-toothed cat.

The clouded leopard has a body size ranging from 24 to 42 inches (616-
1,066 mm) Its tail adds another 21 to 36 inches (550-912 mm) of length.
This leopard's weight falls between 35 and 50 pounds (16-23 kg). Its fur is grayish brown to tawny yellow and has dark markings in a variety of shapes, which seem to form cloudlike patterns.

The clouded leopard was once believed to be exclusively arboreal and nocturnal. Recent observations in captivity and in the wild indicate, however, that it may be considerably more terrestrial and diurnal than previously thought. It is believed to prey upon birds, young buffalo, cattle, deer, goats, monkeys, pigs, and porcupines. The species is difficult to manage in captivity because of a tendency to be highly aggressive toward other species and humans. The exceptionally long canine teeth can easily inflict mortal injury. True to its paradoxical reputation, however, some cats may become extremely affectionate toward humans, even permitting and seeking physical contact.

NORTH CHINESE LEOPARD

This leopard is so rare that humans almost never see it in the wild.
It roams the forests and mountain meadows of northern China and Korea.

It makes its home in a great tangle of fallen trees and shrubs. When it kills smaller animals it devours them right away. But when it comes to larger prey, like deer and wild goats, the leopard drags the animal home to save for several meals.

Don't be scared. The teeth of this snarling leopard won't hurt you.

On the contrary. It's the snow leopard that should be afraid. Its relatives in the wild are in constant danger from poachers who want to shoot them for their pelts and teeth.

Even though shooting leopards is illegal, it's considered "good business." That's because some people still wear leopard fur coats, and others believe that leopard teeth earrings and necklaces have special powers.

SNOW LEOPARD: COLD WEATHER CAT

The shy, nocturnal and virtually unknown Snow Leopard is classified with the big cats, but shares some small cat characteristics, for example it doesn't roar and it feeds in a crouched position.

The Snow leopard has to contend with extremes of climate and its coat varies from fine in summer to thick in winter. The surfaces of its paws are covered by a cushion of hair, which increases the surface area, thus distributing the animal's with more evenly over soft snow and protecting its soles from the cold.

Snow leopards are solitary except during the breeding season, (January to May), when male and female hunt together, or when a female has young.
One to four young are born in spring or early summer in a well-concealed den lined with the mother's fur. Initially, the spots are completely black.
The young open their eyes at 7-9 days, are quite active by two months, and remain with their mother through their first winter

Snow leopards are extremely rare in many parts of their range due to the demand for their skins by the fur trade. Although in many countries it is now illegal to use these furs, the trade continues and the species remains under threat.

SNOW LEOPARD

They live in the snow-covered mountain peaks of Central Asia. How high do these Asian Mountains rise? They reach 20,000 feet in altitude.

The snow leopard's long, thick fur keeps it warm even in the frosty air, and its creamy white and gray color camouflages it in the snow.
Because humans are fond of turning its beautiful coat into coats for themselves, the species is on the brink of extinction.

HYENS

SPOTTED HYENA

This hyena is also known as the "laughing" hyena. Sometimes a hyena lets out a cry that resembles a wild human cackle.

Did you know that a hyena can gorge up to 33 pounds of meat extremely fast? It needs to eat fast because as many as 50 other hungry hyenas may be next to it, noisily feeding on the same piece of meat. Scientists have seen 38 hyenas devour a zebra in 15 minutes, leaving only a few scraps behind.

The hyena is famous for eating animal parts that other meat-eaters won't touch. You might even see it stamping and biting on an ostrich egg, trying to eat it. After devouring everything in sight, the hyena spits out the horns, hooves, and bone pieces, ligaments and hair. If there are leftovers, it buries the meat in a muddy pool. The hyena's good memory leads it back to the hidden food when it's hungry again.

The spotted hyena hunts at night. Hyenas were once thought to be just scavengers (animals that eat the meat left behind by predators). But now we know that they're very good at finding their own food, too.

Hunting together in large packs, hyenas have a very effective way of catching their favorite food. One hyena scares a herd of wildebeest, looks for the weakest member of the herd, and then begins a chase. The other hyenas join in the attack, and a wildebeest feast is soon ready.

If you've ever heard the expression "laughing hyena" and wondered where it came from, it was inspired by the strange, laughter-like sound hyenas make when they're being attacked or chased.

EATING HABITS

True hyenas have thickset muzzles with large ears and eyes, powerful jaws and big cheek teeth to deal with a carnivorous diet. They walk on four- toed feet with five asymmetrical pads and nonretractile claws. The tail is long and bushy (less so in the spotted hyena). Spotted hyenas will eat almost anything, but in the wild much of their food comes from mammals heavier than 44 lb. which they mostly kill for themselves. The frequency of hunting depends on the availability of carrion; spotted hyenas will loot the kills of other carnivores, including lions. Group feeding is often noisy, but rarely involves serious fighting. Instead, each hyena gorges extremely rapidly on up to 33 lb. of flesh. Pieces of a carcass may be carried away to be consumed at leisure or, occasionally, stored underwater.

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