Eduardo Sastre — Campana; Province of Buenos Aires

Official source account — 2022 annual report, printed page 11: Eduardo Sastre found an unfamiliar form while reviewing a photograph from Campana. CIAE compared its body and anatomical projections with birds, suggesting a swallow, probably Tachycineta leucopyga. The agency treated the species suggestion as probable rather than certain and classified the explanation Type B. The object had not been noticed during exposure, and the accidental photographic passage could not be recreated. 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.