Claim: Hamburger–Hamilton stages aimed to provide a detailed description of developmental events, modelled on an earlier system for Axolotl (the Mexican walking fish) by Harrison and the stages also provide advantages over the Carnegie system.
Evidence: Hamburger and Hamilton aimed to provide a detailed description of developmental events, modelled on an earlier system for Axolotl by Harrison. Although colloquially known as a "walking fish", the axolotl is not a fish but an amphibian. The Hamburger–Hamilton system provides advantages over the Carnegie system in that it allows the developing chick to be accurately characterized during all embryonic stages, and is used universally in chick embryology.