All species of animals are classed into two groups: Vertebrata (animals with backbones) and invertebrates(animals without backbones). The five most well known clas… See more

Let’s look in more detail as the 6 main classes of animals that inhabit our planet. The five most well known classes of vertebrates (animals with backbones)are fish, birds, … See more

Fish are aquatic animals in the phylum Chordataand are grouped together with other vertebrates. Fish are distinguished from other animals because they have scales, fins… See more

Birds are a class of animals that contains the greatest number of flying vertebrates. The category of birds is identified by the fact that they have feathers. In fact, birds are the onl… See more