Ezequiel Sánchez — Rosario, Province of Santa Fe

Official source account — 2020 annual report, printed page 64: Ezequiel Sánchez discovered four objects arranged at similar height while reviewing a Rosario photograph. CIAE examined their apparent anatomy and considered them a flock of birds, probably southern lapwings, crossing the frame at exposure. The staggered formation and bird-like features supported this interpretation. It retained a Type B assessment because the brief photographic event could not be recreated or independently verified. The summaries distinguish reported observations from the agency’s proposed explanations. Source Type A/B ratings describe explanatory confidence and are not encounter classes. The map uses an approximate GeoNames locality centroid, not the observation point.