Sharjah24 - AFP: The bird displayed its characteristic black head and blue plumage on the right side of its body, which is the mark of a male Green Honeycreeper. It was a stunning grass green to the left.
According to experts, the specimen spotted in Colombia was a rare example of "bilateral gynandromorphy" -- a condition in which one side of an animal exhibits male characteristics and the other female.
Amateur photographer John Murillo said he first spotted the unique bird through his camera lens when it landed on a feeder to enjoy a meal of bananas and grapes at a nature reserve in Villamaria in Colombia's west in late 2019.
It was then observed by Murillo and experts for more than a year, but never captured.
In an article published last month in the Journal of Field Ornithology, Murillo and a group of bird scientists report the first recorded observation of gynandromorphy in a living Green Honeycreeper (Chlorophanes spiza.)
"In birds, the phenomenon is thought to arise as a result of an error during egg meiosis (a type of cell division), with subsequent double fertilization by separate sperm," they wrote.
Whether the internal organs of the bird were also gynandromporphic and whether it was fertile, was "impossible to tell," the team added.
Green Honeycreepers are small birds found in the tropics from southern Mexico to Brazil.
Murillo, 56, told AFP he felt very fortunate to have observed something "very different from anything we have seen."
He also recounted the bird's "strange" behavior: "it was always alone" at the feeder.
Murillo said the bird seemed more comfortable with humans than with individuals of its kind.
"It is unique in the world, and so it will die," he said.
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