Animals are classified into vertebrates and invertebrates based on the presence of spines or backbones. Vertebrates include fish, amphibians, reptiles, birds, and mammals, each with distinct characteristics and behaviors.

Animals are classified into vertebrates and invertebrates based on the presence or absence of spines. Invertebrates, like octopus and insects, lack backbones and make up the majority of animal species.

Amphibians, such as frogs and salamanders, can live both on land and in water, laying jelly-covered eggs in the water. Reptiles, like turtles and snakes, have dry, scaly skin, lay eggs with protective shells, and cannot breathe underwater.

Birds are unique with feathers, two legs, and wings, while mammals, like humans, are warm-blooded, breathe air, and give birth to live young. Animal classification helps us understand their needs and behaviors.