Chicken angiogenin (ANG) is a secreted ribonuclease belonging to the RNase A superfamily that plays a role in angiogenesis, vascular development, and tissue remodeling. In chickens (Gallus gallus), angiogenin is produced by endothelial cells, epithelial cells, and other stromal cell populations, where it promotes endothelial cell proliferation, migration, and capillary formation through activation of pro-angiogenic signaling pathways and regulation of ribosomal RNA transcription. In addition to its vascular functions, avian angiogenin may contribute to embryonic development, tissue repair, and modulation of inflammatory responses. Baseline expression in healthy chickens is generally low to moderate and varies with developmental stage, but levels may increase during embryogenesis, wound healing, inflammatory stimulation, tumor growth, or hypoxic stress. In poultry science and avian developmental research, chicken angiogenin is of interest in studies of embryonic vascular formation, skeletal muscle development, wound repair, tumor angiogenesis, and growth regulation. Characterizing angiogenin expression in chickens provides valuable insight into mechanisms of vascular biology, developmental regulation, and angiogenesis-related processes in avian and comparative research settings.