Genetic variation in the C-terminal domain of arginine vasotocin receptor in avian species

► We identify two polymorphic regions in the C-terminal of avian vasotocin receptor. ► Some species of passerine birds exhibit intra-specific polymorphism. ► The level of genetic variation differs between passerine and non-passerine birds. ► Indels affect the pattern of predicted palmitoylation sites in C-terminus of AVT2R.