Reporting of partial leucism in Argya malcolmi (Passeriformes: Leiothrichidae) from Haryana, India: implications for plumage aberration studies

Abstract

Undoubtedly, Leucism, a sporadic plumage aberration that is caused by genetic mutations which affect melanin deposition. It has significant implications for avian ecology and evolution of bird species. Present study represents the first photographic documentation of a leucistic Large Grey Babbler (Argya malcolmi) from the state of Haryana, India. A leucistic Large Grey Babbler was observed from Mangar-Bani Forest, Aravalli landscape, Haryana during a field survey in October 2023. The individual displayed predominantly white plumage with pale cream coloured spot on its remiges and tail, while the eyes, beak, and tarsi, retained distinctive pigmentation, distinguishing the condition from albinism. As per State of India’s Birds and IUCN Red List data, the species is classified as Least Concern, although moderate nationally declining population trend are reported. Behavioural observations displayed normal social integration and activity patterns within its flock, with no evidence of social exclusion or risk of predation. This record adds to the limited but growing evidence on leucism in avifauna and is consistent with recent global findings on the prevalence and ecological consequences of plumage abnormality. The study highlights the importance of systematic field documentation for understanding of genetic basis and evolutionary significance of such rare phenotypes. The presence of bird suffering from leucism in such fragmented habitats as Mangar-Bani emphasizes the importance of conservation of such landscapes. To further study the factors and consequences of leucism in wild bird populations, it is recommended to continue monitoring and implementation of genetic approaches.