Enables melanocortin receptor activity and peptide hormone binding activity. Involved in several processes, including adenylate cyclase-modulating G protein-coupled receptor signaling pathway; homoiothermy; and sodium ion homeostasis. Predicted to be integral component of plasma membrane. Predicted to be active in cytoplasm and plasma membrane. Human ortholog(s) of this gene implicated in obesity. Orthologous to human MC3R (melanocortin 3 receptor). [provided by Alliance of Genome Resources, Apr 2022]