Insects are the most successful creatures in the entire animal kingdom.
They are very adaptable and live everywhere - on land, in the air, and in and on water. They are also very small, so they can fit into small places and do not need a lot of food to survive. Insects are invertebrates - they have no backbone. However insects are different from other anthropods because they only have six legs. These other anthropods include millipedes, wood lice and spiders.