Animal Groups & Habitats — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Birds have feathers covering their bodies.
Birds have feathers covering their bodies, which help them fly and stay warm.
2. Fish use gills to breathe underwater.
Fish use gills to take in oxygen from the water so they can breathe.
3. Amphibians can live on land and in water.
Amphibians can live on land and in water because they start life in water and later develop lungs.
4. Mammals are warm-blooded animals that make their own body heat.
Mammals are warm-blooded, meaning their bodies stay at the same temperature no matter what the weather is like.
5. Reptiles lay eggs with tough, leathery shells.
Reptiles lay eggs with tough, leathery shells that protect the babies growing inside.
6. A frog is an example of an amphibian.
A frog is an amphibian because it starts life in water as a tadpole and later lives on land.
7. Birds lay eggs and most of them can fly.
Most birds can fly using their wings, though some birds like penguins and ostriches cannot.
8. Fish have fins that help them swim through water.
Fish have fins that help them move through the water and steer in different directions.
9. A penguin is a bird even though it cannot fly.
A penguin is still a bird because it has feathers and lays eggs, even though it cannot fly.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Eagle
→ Bird
Mammal
Goldfish
→ Fish
Amphibian
Frog
→ Amphibian
Fish
Tiger
→ Mammal
Bird
Eagle → Bird because it has feathers and lays eggs. Goldfish → Fish because it lives in water and breathes with gills. Frog → Amphibian because it can live on land and in water. Tiger → Mammal because it has fur and feeds its babies milk.