In a remarkable revelation, a green honeycreeper (Chlorophanes spiza) displaying male plumage on one side and female colouring on the other has been captured on camera, marking a rare instance of bilateral gynandromorphism. The bird’s aqua-blue and yellow-green feathers create a striking visual division, distinct from the typical appearance of males and females of this species.
EXTRAORDINARY ENCOUNTER IN COLOMBIAN NATURE RESERVE
Amateur ornithologist John Murillo made the groundbreaking discovery at a bird-feeding station on a small farm in a nature reserve near Manizales, Colombia. The unique sighting caught the attention of Hamish Spencer, a zoology professor at the University of Otago in New Zealand, who was visiting Colombia at the time. This bilateral gynandromorph is an extremely rare occurrence in birds, with the last documented case dating back over a century.
BILATERAL GYNANDROMORPHISM: AN ANOMALY IN AVIAN GENETICS
Bilateral gynandromorphism in birds is attributed to a cell division error during egg formation, allowing fertilization by two different sperm. The resulting bird exhibits distinct male and female characteristics on either side of its body. This phenomenon is exceptionally uncommon, making such sightings a privileged experience for birdwatchers.
THE PECULIAR BEHAVIOR OF THE SPLIT-COLORED BIRD
Over a span of 21 months, the bird frequented the feeding station, returning regularly to partake in fresh fruit and sugar water provided by the farm owners. However, its appearances were intermittent, with periods of 4–6 weeks followed by an absence of around 8 weeks. The gynandromorphic bird displayed an avoidance behavior towards others of its species, suggesting limited interaction and potential reproductive challenges.
IMPLICATIONS AND SIGNIFICANCE IN NATURE
While the external split coloring is visually captivating, the internal aspects of this bird, such as its organs, remain speculative. Birds lack sex hormones that permeate their entire bodies, making it challenging to confirm the internal anatomical division. Bilateral gynandromorphism is a rare delight across various species, showcasing the intricacies and exceptions within the animal kingdom.
A CALL TO TREASURE NATURE’S ANOMALIES
Professor Hamish Spencer emphasizes the importance of cherishing these exceptions in nature, encouraging a vigilant eye for peculiarities. The discovery adds to the tapestry of biodiversity, underlining the diversity and wonders found in the animal kingdom.
This study was published in the Journal of Field Ornithology.
Feeding primarily on nectar, a considerable number of honeycreepers are often referred to as sugarbirds. These avian species are characterized by their diminutive size, featuring thin and downcurved bills. Notably, their tongues are brushy and occasionally double-tubed.
