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Vertebrates

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Designed By:
Christian Alas
Created and illustrated By:
Angelo Romero and Camilo Sanabria

Vertebrates

Animals can be divided into two groups. Those groups are vertebrates and invertebrates. The group of animals that have backbones are the ones called vertebrates. Animals that are vertebrates can look very different but they all have one thing in common: they all have a hard internal skeleton or a backbone.

Their backbones help them move and help support their body. Although only a small percentage of animals are vertebrates, those that are vertebrates tend to dominate their environment with their advantages in size and mobility. Dogs, pigeons, lions, horses, dolphins and humans are all vertebrates. Another interesting thing about vertebrates is that they come in all sizes!

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They can be the size of a small tuna fish or the size of a humpback whale! Next time you go to the zoo, see if you can pick out which animals are vertebrates and see what similarities you can find in the way that they stand and move. Although vertebrates all have backbones, they can still perform different tasks such as swimming, flying, and running.

The difference between vertebrates and invertebrates should not be confused with the difference between warm and cold-blooded animals. Warm-blooded animals keep their body temperatures.

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Warm-blooded animals are called endothermic. On the other hand, cold-blooded animals do not have hair or fur to keep them warm. Instead, cold-blooded animals get their body temperature from the environment that they are in. Cold-blooded animals are called ectothermic.

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READING QUESTIONS

1. What is the writer’s main idea?

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2. What example supports the writer’s main idea?

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3. How does the example help the writer’s argument?

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4. What do you think about the story?

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