amphibians examples :: Article Creator Different Types Of Animals Animal classification Animals can be divided into groups. We call this 'classification'. Classification allows us to group animals together depending on their similarities and differences. Animals are divided into two main groups: Animals with a backbone are called vertebrates. Animals without a backbone are called invertebrates. Vertebrates and invertebrates can be sorted into smaller groups. Vertebrates, for example, are divided into mammals, birds, reptiles, amphibians and fish. Image caption, Squirrels are one of the common mammals found in Northern Ireland Mammals Mammals are warm-blooded animals with hair or fur and can produce milk to feed their young. They have three ear bones, which allow for better hearing. They also have a special muscle called a diaphragm muscle that helps in breathing. Mammals come in various shapes and sizes, from tin...