Animals can be classified in many ways. However, scientists classify them into six main groups. They are mammals, birds, reptiles, amphibians, invertebrates and fish.
The group of mammals includes humans. All mammals have hair or fur, and they produce milk through their mammary glands. Mammals and birds are the animal classes that are warm-blooded.
The group of birds is very diverse. However, all birds have two legs and can lay eggs. Most of them can fly.
Unlike mammals and birds, reptiles are cold-blooded. They are often covered in scales and rely on their surrounding environment to regulate their body temperature. They have a spine and are thus vertebrates.
Amphibians have moist skin with no scales. Because they are permeable, they are very sensitive to toxins. One key characteristic of amphibians is a life cycle that include larval stages.
The animal kingdom can be divided into two large groups, vertebrates and invertebrates. Invertebrates are animals that have no spinal cord. This includes jellyfish and insects.
Fish are aquatic animals. Their main characteristic is the presence of gills that enables them to breathe underwater. They all have fins that help them to swim.
All animals can be classified into six main groups. Two of these, birds and mammals are warm-blooded. The group of invertebrates lacks a spinal cord. The other five groups, however, all have one.
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