2do ensayo. INGLES ''Animal Species''

Universidad Alfonso Reyes.

División Preparatoria.

Animal Species

2 ensayo.

Ruth Alondra Sánchez Soto.

L-10676

3°D

Maestro: José López Navarrete

Ingles 3.

Guadalupe, N.L, 6 de julio, 2012

Mammals

The 4.500 to 5.000 different species of mammals living in the present study in groups. These groups are based on the relationship between species, which is near or far according to evolution, and leads to the similarities and differences between species. Here are some mammals that exist in groups according to the relationship between them.

Squirrels, Beaver, Porcupine, Mice

Armadillos

Whales, Dolphins

Horses, Rhinoceroses, Tapirs

Kangaroos, Koala, Possums

Pork Homiguero

Rabbits, Hares, Spades

Elephants

Urchins, and other Gimnuros

Cats, Dogs, Bears, Seals

Lemurs Gliders

Monkeys, Lemurs, Apes

Elephant shrews

Platypus, echidna, Nadiok

Sloths, Anteaters

Moles, shrews and Almiquíes

Golden moles, tenrecs

Mammals are vertebrates, like amphibians, reptiles, birds and fish. At first glance differ from these other mammalian animals to have hair on the body surface. In most mammalian species, not all, females have breasts by leaving the milk to feed their young. True that all species possess mammary glands and all feed their babies with milk generated in these glands, however, there are species that do not have breasts. Of course, there are many internal differences between mammals and other vertebrates, but that does not help, do not say much to distinguish at a glance.

Mammals descended from reptiles. There appear to be very similar because mammals arose about 195 million ago years. Although it is possible that the two branches are separated much earlier than that because these reptiles were descended from reptiles present. At that time dominated the world of reptiles, and mammals that there were no bigger than small shrews. Over time each group evolved in different directions, reptiles became smaller and larger mammals.

Elephants

Elephants are large land mammals in two extant genera of the family Elephantidae: Elephas and Loxodonta, with the third genus Mammuthus extinct. Three living species of elephant are recognized: the African bush elephant, the African forest elephant and the Indian or Asian elephant;^] although some group the two African species into one and some researchers also postulate the existence of a fourth species in West Africa. All other species and genera of Elephantidae are extinct. Most have been extinct since the last ice age, although dwarf forms of mammoths might have survived as late as 2,000 BCE. Elephants and other Elephantidae were once classified with other thick-skinned animals in a now invalid order, Pachydermata.

Elephants are the largest living land animals on Earth today. The elephant's gestation period is 22 months, the longest of any land animal. At birth, an elephant calf typically weighs 105 kilograms (230 lb). They typically live for 50 to 70 years, but the oldest recorded elephant lived for 82 years. The largest elephant ever recorded was shot in Angola in 1955. This male weighed about 10,900 kg (24,000 lb), with a shoulder height of 3.96 metres (13.0 ft), 1 metre (3.3 ft) taller than the average male African elephant. The smallest elephants, about the size of a calf or a large pig, were a prehistoric species that lived on the island of Crete during the Pleistocene epoch.

Elephants are a symbol of wisdom in Asian cultures and are famed for their memory and intelligence; their intelligence level is thought to be comparable to that of dolphins and primates.  Aristotle once said the elephant was "the beast which passeth all others in wit and mind." The word "elephant" has its origins in the Greek ἐλέφας, meaning "ivory" or "elephant".