A Brief Description of Animal Classes:
Birds: Warm-blooded vertebrates with feathers, wings, and beaks. They lay eggs and have hollow bones, making them lightweight for flight.
Reptiles: Cold-blooded vertebrates with scales, most lay eggs. They often have tough, dry skin and can thrive in various environments.
Amphibians: Cold-blooded vertebrates that transition from an aquatic larval stage (with gills) to a terrestrial adult stage (with lungs). Their skin is moist and permeable, making them susceptible to dehydration.
Mammals: Warm-blooded vertebrates with fur or hair, they give birth to live young and nurse them with milk. Mammals are diverse and can be found in various habitats.
Fish: Cold-blooded vertebrates living exclusively in water. They breathe through gills and have fins for movement. Fish are incredibly diverse, with different species adapted to a wide range of environments.