Horse-donkey are almost always because horses have 64 whereas donkeys have 62, producing offspring with 63 chromosomes. Mules are much more common than hinnies. This is believed to be caused by two factors, the first being proven in cat hybrids, that when the chromosome count of the male is the higher, fertility rates drop (as in the case of stallion x jennet).The lower progesterone production of the jenny may also lead to early embryonic loss. In addition, there are reasons not directly related to reproductive biology. Due to different behavior, jacks are often more willing to cover mares than stallions are to breed jennys. Further, mares are usually larger than jennys and thus have more room for the ensuing foal to grow in the womb, resulting in a larger animal at birth. It is commonly believed that mules are more easily handled and also physically stronger than hinnies, making them more desirable for breeders to produce, and it is unquestioned that mules are more common in total number.
Reindeer (Animal of Russia)
Some populations of the North American caribou migrate the furthest of any terrestrial mammal, travelling up to 5,000 km (3,100 mi) a year, and covering 1,000,000 km2(390,000 sq mi). Other populations (e.g., in Europe) have a shorter migration, and some, for example the subspecies R. t. pearsoni and R. t. platyrhynchus (both restricted to islands), are residents that only make local movements.
Normally travelling about 19–55 km (12–34 mi) a day while migrating, the caribou can run at speeds of 60–80 km/h (37–50 mph). During the spring migration smaller herds will group together to form larger herds of 50,000 to 500,000 animals but during autumn migrations, the groups become smaller, and the reindeer begin to mate. During the winter, reindeer travel to forested areas to forage under the snow. By spring, groups leave their winter grounds to go to the calving grounds. A reindeer can swim easily and quickly, normally at 6.5 km/h (4.0 mph) but if necessary at 10 km/h (6.2 mph), and migrating herds will not hesitate to swim across a large lake or broad river.
Alpaca (Animal of Peru)
Alpacas make a variety of sounds. When they are in danger, they make a high-pitched, shrieking whine. Some breeds are known to make a "wark" noise when excited. Strange dogs—and even cats—can trigger this reaction. To signal friendly or submissive behavior, alpacas "cluck," or "click" a sound possibly generated by suction on the soft palate, or possibly in the nasal cavity.
Individuals vary, but most alpacas generally make a humming sound. Hums are often comfort noises, letting the other alpacas know they are present and content. The humming can take on many inflections and meanings.
When males fight they scream a warbling bird-like cry, presumably intended to terrify the opponent.
Because of their preference for using a dung pile, some alpacas have been successfully house-trained.
Alpacas use a communal dung pile, where they do not graze. This behaviour tends to limit the spread of internal parasites. Generally, males have much tidier, and fewer dung piles than females who tend to stand in a line and all go at once. One female approaches the dung pile and begins to urinate and/or defecate, and the rest of the herd often follows.
Cochineal Insect (Animal of Chile, Mexico)
Cochineal insects are soft-bodied, flat, oval-shaped scale insects. The females, wingless and about 5 millimetres (0.20 in) long, cluster on cactus pads. They penetrate the cactus with their beak-like mouthparts and feed on its juices, remaining immobile. After mating, the fertilized female increases in size and gives birth to tiny. The nymphs secrete a substance over their bodies for protection from water loss and excessive sun. This substance makes the cochineal insect appear white or grey from the outside, though the body of the insect and its nymphs produces the red pigment, which makes the insides of the insect look dark purple. Adult males can be distinguished from females in that males have wings, and are much smaller in size than females.
It is in the nymph stage (also called the crawler stage) that the cochineal disperses. The juveniles move to a feeding spot and produce long wax filaments. Later they move to the edge of the cactus pad where the wind catches the wax filaments and carries the cochineals to a new host. These individuals establish feeding sites on the new host and produce a new generation of cochineals. Male nymphs feed on the cactus until they reach sexual maturity; when they mature they cannot feed at all and live only long enough to fertilize the eggs. They are therefore seldom observed. In addition, females typically outnumber males, due to environmental factors.
American Mink (Animal of North America)
Because of numerous incidents of domestic mink escaping from fur farms and establishing themselves in the wild, concern has arisen among conservationists of the possible repercussions such escapes may have on natural wild mink populations. Domestic mink are larger than wild mink, which may cause problems with the ecosystem when they escape. Mink are solitary, territorial animals and are intolerant of other mink. In times of overpopulation, mink control their own numbers by either killing each other through direct conflict or by causing weaker mink to be driven from territory until starvation sets in. When hundreds or thousands of released domestic mink flood an ecosystem, it causes a great disturbance for the wild mink, resulting in the deaths of the majority of the released mink and many of the wild mink from starvation or injuries incurred fighting over territory. When a domestic mink survives long enough to reproduce, it may cause problems for the wild mink populations.The adding of weaker domestic mink genes into wild mink populations is believed by some to have contributed to the decline of mink populations in Canada.
A 2006 study in Denmark concluded that, due to frequent escapes from existing mink farms, “Closing mink farms may result in a crash of the free-ranging population, or alternatively it may result in the establishment of a better-adapted, truly feral population that may ultimately outnumber the population that was present before farm closures.” The study reported that more information would be necessary to determine the outcome. Another Danish study reported that a significant majority of the “wild” mink were mink which had escaped from fur farms. 47% had escaped within two months, 31% had escaped prior to 2 months, and 21% “may or may not have been born in nature.” The survival rate for recently released mink is reportedly lower than for wild mink, but if feral mink survive at least two months, their survival rate is the same as for wild mink. The authors suggest that this is due to the rapid behavioural adaptation of the animals.
Domesticated silver fox(Animal of Soviet Union)
14.Canary (Animal of Canary Islands, Europe)
15.Fancy rat (Animal of UK)
Domesticated silver fox(Animal of Soviet Union)
Belyaev believed that the key factor selected for in the domestication of dogs was not size or reproduction, but behavior; specifically, amenability to domestication, or tameability. He selected for low , that is, the distance one can approach the animal before it runs away. Selecting this behavior mimics the natural selection that must have occurred in the ancestral past of dogs. More than any other quality, Belyaev believed, tameability must have determined how well an animal would adapt to life among humans. Because behavior is rooted in, selecting for tameness and against aggression means selecting for physiological changes in the systems that govern the body's and. Belyaev decided to test his theory by domesticating foxes; in particular, the silver fox, a dark color form of the red fox. He placed a population of them in the same process of domestication, and he decided to submit this population to strong selection pressure for inherent tameness.
The result is that Russian scientists now have a number of domesticated foxes that are fundamentally different in afferent and behavior from their wild forebears. Some important changes in phylosofy and morphology are now visible, such as mottled or spotted colored fur. Many scientists believe that these changes related to selection for tameness are caused by lower production in the new breed, causing physiological changes in very few generations and thus yielding genetic combinations not present in the original species. This indicates that selection for tameness (i.e. low flight distance) produces changes that are also influential on the emergence of other "dog-like" traits, such as raised tail and coming into every six months rather than annually.
Animal List
1.Central Bearded Dragon(Animal of Australia)
2.Eclectus Parrot (Animal of Australia, Indonesia, New Guinea,Solomon Islands)
3.Greater Rhea (Animal of South America)
6.Mongolian Gerbil (Animal of Africa and Asia)
7.Green Iguana (Animal of South America)
9.Andean Marsupial Tree Frog(Animal of Ecuadorian Andes)
10.Australian Green Tree Frog(Animal of Australia)
11.Argentine Horned Frog(Animal of Argentina)
12.Cranwell's horned frog(Animal of Argentina)
13.Leopard gecko (Animal of Southeast to central Asia)
15.Fancy rat (Animal of UK)