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Ch. 1 Lesson 4How are animals
classified?
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vertebrate•animal with a backbone
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5 classes
of vertebrates
mammals reptiles birds amphibians fish
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Vertebrate Characteristics
Fish Scales, live in water, cold-blooded, lay eggs, gills
Amphibians Smooth skin, live in water and land, cold-blooded, lay eggs
Reptiles Scales, lay eggs, cold-blooded, lungs
Mammals Hair or fur, warm-blooded, live births, lungs
Birds Feathers, warm-blooded, lay eggs, lungs
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invertebrates
mollusks worms arthropods
no backbone
cnidarians
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arthropod
• largest group of invertebrates
• jointed legs
• divided into sections
• covered by hard exoskeleton
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The Life Cycle of the Brown Garden Snail
1. lays its eggs
2. eggs hatch in 2-4 weeks
3. newly hatched snails must find food
4. adults reproduce
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vertebrate
• animal with a backbone
![Page 10: 4th Grade Ch. 1 Lesson 4 How Are Animals Classified](https://reader033.vdocuments.mx/reader033/viewer/2022061217/54b37ec94a795946608b45ca/html5/thumbnails/10.jpg)
5 classes
of vertebrates
mammals reptiles birds amphibians fish
![Page 11: 4th Grade Ch. 1 Lesson 4 How Are Animals Classified](https://reader033.vdocuments.mx/reader033/viewer/2022061217/54b37ec94a795946608b45ca/html5/thumbnails/11.jpg)
invertebrate• animal without a backbone
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arthropod• largest group of invertebrates
• jointed legs
• divided into sections
• covered by hard exoskeleton
![Page 13: 4th Grade Ch. 1 Lesson 4 How Are Animals Classified](https://reader033.vdocuments.mx/reader033/viewer/2022061217/54b37ec94a795946608b45ca/html5/thumbnails/13.jpg)
invertebrates
•Which are there more of: vertebrates or invertebrates?
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• Use a large space in a cafeteria, gymnasium, or playground to model the length of a giant squid by marking off a distance of 15 m. Use two basketballs to demonstrate the size of thesquid's eyes. Then, mark off a distance of 6 m so students can compare the length of a Burmese python with the length of the giant squid. Have students use a measuring tape tofind the lengths in feet and inches.
Activity-Compare Animal Sizes