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Animal

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Dan Watcharaplakornkul

on 6 May 2010

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Transcript of Animal

Mammals Aves The vertebrate class Aves includes the birds, an extremely distinctive and successful clade, with an estimated 9000 species worldwide, including the snowy owl pictured here. Although descended from the dinosaurs, birds have evolved remarkable specializations for flight: a unique "one-way" breathing system, light yet strong hollow bones, a skeleton in which many bones are fused or lost, powerful flight muscles, and -- most importantly -- feathers.

Mollusca Molluscs are a clade of organisms that all have soft bodies which typically have a "head" and a "foot" region. Often their bodies are covered by a hard exoskeleton, as in the shells of snails and clams or the plates of chitons. Echinoderm Echinoderms have a few important aspects in common. They have bony ossicles in their body. They have a water-vascular system which pumps water through the madroporite. They also have small jaws that are supported by the water-vascular system. And they have tube feet which they use to attach to objects, for protection, as well as to obtain food. They have radial symmetry and most can regenerate lost limbs.

Arthropoda The Phylum Arthropoda is the third of the major phyla to colonise the sea and to establish successfully on land. With almost a million species described to date, the Arthropods make up the largest phylum in the Animal Kingdom. Four out of five animal species on earth today are arthropods. Ninety percent of arthropods are insects; the other ten percent of this diverse and prolific group includes crabs, spiders, scorpion, and a host of lesser-known animals. Arthropods derive their name from their jointed legs Crustacean Crustaceans are a group of animals that have a hard exoskeleton, jointed legs, and a segmented body that is bilaterally symmetrical. They have two pairs of sensory antennae, one pair of mandibles (for chewing food), and two pairs of maxillae (to help the mandibles in positioning the food). Crustaceans are invertebrates (they lack a backbone) and arthropods (which also includes the insects). Amphibian Amphibians are vertebrates that spend part of their lives under water (breathing with gills) and the remainder on land (breathing with lungs). Amphibians are cold-blooded; their body temperature depends on the temperature of their environment. There are three groups (orders) of living amphibians: newts and salamanders (urodeles); frogs and toads (anurans); and caecilians (the worm-like gymnophiones).
Reptile insects Mammals are one of the 6 main classes of animals. Animal classes are groups of animals that scientists consider to be alike in some important ways. Mammals are the animal class that people belong to. The reptiles were from the outset of classification grouped with the amphibians. Linnaeus, working from species-poor Sweden, where the common adder and grass snake are often found hunting in water State insects are designated by 41 individual states of the fifty United States. Some states have more than one designated insect, or have multiple categories (e.g., state insect and state butterfly, etc.). More than half of the insects chosen are not native to North America, because of the inclusion of three European species (European honey bee, European mantis, and 7-spotted ladybug).
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