Animal Species Essay

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Living creatures on Earth need three basic things in order to survive: the

ability to eat, breath, and reproduce. All animals are able to do so. Animals

are divided into species, among these species are: Mammals, Reptiles,

Arthropods, and Aves. Mammals, also known as Mammalia, come from Latin meaning

mamma breast. They are called this due to the fact that Mammals are the only

animals which have mammary glands, which enable them to nourish their young

solely on milk secreted from these glands. Mammals are warm blooded, and all,

except for marine mammals, are mostly or completely covered with hair. Mammals

give birth to live young, however, there are a few rare exceptions to this rule.

A few mammals, such as the platypus, lay eggs instead of having live young. Yet

once the eggs are hatched the females do have mammary glands, and produce milk

for their young. Another feature of mammals is that their heart has four

chambers and a muscular diaphragm that separates their chest and abdominal

cavity. The mammal class includes: Dogs, cats, horses, beavers, dolphins, bats

and humans. Another animal species are Reptiles, also known as Reptil which is

Latin for Reptus, meaning to crawl. Reptiles are usually hairless with dry,

scaly skin. They are cold-blooded, which means in order for them to maintain a

stable body temperature, they must be exposed to some heat source, such as the

sun, or a rock warmed by the heat of the day. Due to the need for warmth,

Reptiles are naturally found in warm, dry climates. All reptiles, except for

snakes, have low slung bodies with long tails, balanced on four awkwardly small

limbs. Although there are a few aquatic Reptiles (Reptiles who live mainly in

water), they all must come up to the surface for oxygen. Reptiles do not give

birth to live young. Instead, they lay eggs on land. The female usually buries

the eggs in warm dirt or sand...

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