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A Pennsylvania bird watcher had what he calls a once-in-a-lifetime encounter when a Northern cardinal perched in a tree appeared to be both male and female. James R. Hill III has marveled at the feathered animals for 48 years, but on Saturday he saw a one in a million bird with bright red like a male cardinal on one side and brownish white like a female on the other. Hill describes the rare cardinal as a bird divided right down the middle, half male and half female that stood out as pretty unusual.   Its striking appearance is the result of double fertilization, in which a female egg cell that developed with two nuclei is fertilized by two sperm.

United statesGrand valleyGreen valleyJamesr hillShirley caldwellDaniel hooperNational geographicCornell lab of ornithologyNorthern cardinalCornell labNorth americaஒன்றுபட்டது மாநிலங்களில்மாபெரும் பள்ளத்தாக்குபச்சை பள்ளத்தாக்குஷெர்லி கால்டுவெல்டேனியல் ஹூப்பர்