1. Fish: These aquatic creatures have gills for breathing underwater, fins for movement, and scales covering their bodies. Examples include sharks, tuna, and goldfish.
2. Amphibians: These animals can live both on land and in water. They have smooth, moist skin, and most lay their eggs in water. Examples include frogs, toads, and salamanders.
3. Reptiles: Reptiles have dry, scaly skin and lay eggs on land. They are cold-blooded, meaning their body temperature fluctuates with their environment. Examples include snakes, lizards, turtles, and crocodiles.
4. Birds: Birds are warm-blooded and have feathers, wings, and beaks. They lay eggs and are known for their ability to fly (though not all birds fly). Examples include eagles, penguins, and sparrows.
5. Mammals: Mammals are warm-blooded and have hair or fur, give birth to live young, and nurse their offspring with milk. Examples include dogs, cats, humans, and whales.