Rhinos

 Rhinos are the third largest land animal. There horn is made out of keratin. That is what are nails and hair is made out of. There horn is a very good weapon.They are nearsighted.Oxpeckers hang out on the rhinos back they eat the ticks on the rhinos back.The oxpeckers get there meal and the rhino gets cleaned it is called a symbiotic relationship.(They scream when they sense danger.)They weigh 3,000 pounds the third heaviest land anmal in the world.