Chordates include a range of animals. In order to be a chordata you mmust have a couple things. First they must be deuterstomes, which means they have a mouth and an anus, so 2 holes not one. They must also have a notochord during their embroyological time period, they must have a dorsal nerve cord. They must also have a post anal tail. They must also have pharyngeal slits. Fish have all of these as well as reptiles , amphibians, humans, and birds.