| Of all the classes of animal life,
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| | of muscle called the diaphragm. A
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| mammals are considered the most advanced
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| | mammal's lower jaw has a single bone on
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| and probably the most popular class.
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| | each side. Mammals also have different
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| Dogs and cats are mammals, squirrels and
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| | types of teeth adapted to different uses.
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| rabbits in our backyards are mammals as
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| | And most importantly, mammal brains are
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| well. Horses, sheep, baboons, giraffes
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| | much more highly developed than the
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| and elephants are mammals. For that
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| | brains of any other animal.In the
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| matter, we human beings are mammals
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| | struggle to survive, warm blood, improved
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| too.Mammals vary greatly in size. The
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| | methods of caring for young and superior
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| smallest mammal is the shrew with a body
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| | intelligence have all given mammals great
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| that is only a little more than 2 inches
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| | advantages through the ages. In fact,
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| long and weighs less than some insects.
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| | many scientists consider mammals as the
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| In contrast, the largest mammal is the
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| | dominant animals of the world.Yet mammals
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| blue whale, which can sometimes measure
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| | did not start out immediately as mammals.
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| up to 100 feet long and weigh as much as
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| | Strange as it may seem, they rose from
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| 130 tons. Mammals also differ in
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| | the reptile family. In the Mesozoic era,
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| appearance in shape. Most of them walk
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| | a branch of reptiles began to grow coats
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| on four legs, but not all of them do.
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| | of hair instead of armor and slowly
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| Some mammals fly. Dolphins and whales
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| | turned warm-blooded. Some of them began
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| have lost their hind limbs and now have
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| | to keep eggs inside their bodies instead
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| taken fish-like shapes and spend their
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| | of laying eggs. The first mammals were
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| entire lives in the ocean.What is a
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| | probably very tiny and timid creatures,
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| mammal? Mammals are vertebrates - they
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| | like today's rats and mice. They were
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| are animals with backbones. All mammals
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| | nocturnal and hid for protection during
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| have lungs and breathe in air and all of
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| | the day. When conditions of the Earth
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| them are warm-blooded (they are able to
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| | gradually changed, the dinosaurs could
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| maintain a constant body temperature
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| | not adapt to this dramatic shift, so
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| regardless of the outside temperature.)
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| | their numbers grew smaller and smaller.
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| Mammals and birds share a common
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| | When they died out, the more adaptable
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| characteristic - the possession of
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| | mammals later arose in the Miocene
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| four-chambered hearts that circulate
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| | epoch.Between 3500 and 5000 species of
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| blood efficiently to all parts of the
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| | mammals live in the world today and more
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| body. All mammals, except two types that
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| | varieties under them. Many of these
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| lay eggs, give birth to living young and
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| | animals can trace their lineage to their
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| provide protection and care for them
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| | ancestors that adapted and survived
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| before and after birth. Mammals are the
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| | through the Ice Age. Now, mammals have
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| only animals that possess true hair and
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| | developed in a bewildering variety of
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| the capacity to produce milk. In fact,
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| | sizes and shapes, classified by
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| the word "mammal" comes from the Latin
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| | scientists according to body structure
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| word "mamma" which means "breast".Mammals
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| | and relationships. In all, under the
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| have other characteristics that are not
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| | mammal kingdom, there are now 18
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| so obvious. A mammal's heart and lungs
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| | different groups or orders.
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| are separated from the stomach by a wall
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