Three distinct types of dwarfism have been described in chickens based on the physiological and genetic properties: sex‐linked dwarfism, which is well studied and caused by mutations in the growth hormone receptor gene (GHR) (Agarwal et al., 1994; Burnside et al., 1992); autosomal dwarfism (adw) that is associated with a nonsense mutation in the transmembrane protein 263 gene (TMEM263) (Wu et al., 2018); and third the bantam phenotype, for which the genetic cause is unknown. Here, GHR is linked to Severe short stature.