Photo by BarrytheBirder
No. 1 ~ House Sparrow
No. 2 ~ European Starling
No. 3 ~ Ring-billed Gull
No. 4 ~ Barn Swallow
*From 2021 research by Corey Callaghan at the University of New South Wales in Australia and reported by Adam Vaughan, of NewScientist.
Please comment if you wish.
BarrytheBirder
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