Example 1: A fish is a water animal because it swims in the water and breathes through gills.
Example 2: A dolphin is a water animal too. It comes to the surface to breathe air but lives in the ocean.
Example 3: A frog starts life in water as a tadpole but can also live on land as an adult.
Fun Fact: Some water animals, like sea turtles, can live both in the sea and on land!