1. Sunken Lesson Animals with Backbones
Grade 3
Copyright © 2002 Glenna R. Shaw and FTC Publishing
All Rights Reserved

2. Fish Live in water Most have scales and fins
Use their fins to move through the water
Use gills to breathe

3. Amphibians Hatch from eggs laid in water
When young, they look like fish and have gills like fish.
They grow legs.
Gills are replaced by lungs.
They can live on land when older.
They can stay underwater for a long time.
Frogs, toads, salamanders, and newts are examples.

4. Reptiles Have scales Lay eggs with leathery shells
Most live all their life on land
Lay their eggs on land
Lizards, snakes, turtles, and crocodiles are examples.

5. Birds Have wings and beaks Are the only animals that have feathers
Lay eggs with shells
Use their wings to fly

6. Mammals Have fur or hair Give birth to live babies
Have only a few babies at a time
The female feeds the young milk from her body
The young are taken care of for a long time
Humans, dogs, horses, cows are mammals.