Fishes, amphibians, reptiles, birds and mammals are grouped into a common higher category in animal classification. Whic
Classes containing fishes, amphibians, reptiles, birds and mammals are grouped into phylum Chordata because they share features such as a notochord and a dorsal hollow neural system.
Ref: NCERT Class 11 Biology Chapter 1: The Living World Taxonomic Categories - Family Order Class Phylum Kingdom