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Hello class! Welcome to a new natural science unit. Unit number two, vertebrates.

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Lesson number one. What are vertebrates? Mirror world. Vertebrates are animals

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with a back bone and a skeleton inside of them. This is a cat skeleton. As you

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can see it has many many bones. A very important bone is the back bone. Next.

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Most vertebrates have a head, limbs and a tail. Here we have a cat skeleton and a

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dog skeleton. This is the head, this is the tail and these are the limbs. There

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are many bones inside of these animals. Mirror world. Most vertebrates have a head,

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limbs and a tail. Other vertebrates also have wings and a beak. Here we have a

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chicken skeleton. These are the wings and this is the beak. Next.

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Warm-blooded or cold-blooded. Warm-blooded animals. In this group we

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include birds and mammals. Cold-blooded. In this group we include fish, reptiles

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and amphibians. Next. What are warm-blooded vertebrates? Remember in this

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group we include mammals and birds. Mirror world. Warm-blooded vertebrates

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have a constant body temperature. Remember the body temperature is always

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very similar. Next. Cold-blooded vertebrates. Here we include fish, reptiles

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and amphibians. Mirror world. Cold-blooded vertebrates can change their body

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temperature.