Grasshoppers are crustaceans of the Arthropoda genus and birds of the Cordata genus Avis. The spine of the grasshopper's body. Its body is fragmented with articular appendages , head has anterior and antennae , body covering is made of chitin , body is covered with bloody hemorrhoids. These traits are found in crustaceans of the Arthropoda genus . On the other hand , the body of the bird is covered with feathers , the front two legs have become winged and the beak has turned into a beak. The air sac is present in its lungs for flight. It is a warm-blooded animal. Its embryonic notochord has been transformed into a spinal cord. Besides, its bones are hard , light and hollow. These characteristics can be seen in the birds of the avid class of the Cordata period. In other words, birds are animals of Avis class. Grasshoppers and birds belong to different classes due to the above reasons.