1. Vertebrates or Invertebrates We divide the animal Kingdom into two groups: Vertebrates are animals with a backbone inside their bodies. Fish, dogs and humans are examples of vertebrates.

2. Vertebrates or Invertebrates Invertebrates do not have a skeleton. Some examples of these are spiders, flies and caterpillars. Vertebrates are often larger and have more complex bodies than invertebrates. However, there are many more invertebrates than vertebrates.

3. Cold-blooded vertebrates depend on their surroundings to keep their body temperature. When there is no sun, and the air is cold, the animal gets cold. When it is sunny and hot, the animal gets hot, and generally more active. Vertebrates

5. Vertebrate classes Class Main features Examples amphibians moist permeable skin frog, newt, salamander fish gills, wet scales goldfish, shark, cod reptiles dry scales crocodile, lizard, snake birds feathers, beaks budgerigar, sparrow, ostrich mammals fur, produce milk rabbit, kangaroo, human, dolphin