Animal Species

Length: 3 Pages 643 Words

Holly Ratliff July 5, 2000 Beckley English 2 Animal Species 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 Continue...

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All reptiles, except for snakes, have low slung bodies with long tails, balanced on four awkwardly small limbs. 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. Their feathers, though light, protect against cold and wet and have great strength. Arthropods tend to have many legs and feet, giving purpose to their name. Each of these animal species are very unique and crucial to the Earth. The class of Aves include: geese, flamingos, humming birds, and penguins. Aves, also known as Birds, are warm-blooded, egg-laying animals. Arthropods are invertebrate, which means they have no backbone. The exoskeleton is jointed, allowing Arthropods to move, and as the they grow, their exoskeleton sheds, or molts, and a new, larger one grows to replace it. A very beautiful, yet simply diverse animal species are Aves. The mammal class includes: Dogs, cats, horses, beavers, dolphins, bats and humans. Reptiles are usually hairless with dry, scaly skin. feature of mammals is that their heart has four chambers and a muscular diaphragm that separates their chest and abdominal cavity. Their young are cared for by the parents until they reach maturity.


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