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In mid-2016 an odd rumor began traversing fun facts sites and groups, holding that the yolks of flamingo eggs are bright pink: The claim made simultaneous appearances on Reddit, Facebook, and countless blogs devoted to unbelievable facts or tidbits of trivia, but an initial red flag regarding the claim appeared when we reverse-searched the image depicted above and found it was clearly a doctored stock photograph of a standard, boring yellow-yolked egg: The finding was disappointing, as surely the sight of a cracked egg with a bright pink yolk would be noteworthy enough to warrant photographic capture at one point or another, but none was to be found. We also located a YouTube video of abandoned flamingo nests showing cracked eggs, and although the footage showed no freshly broken eggs, it did capture remnants of flamingo egg yolks (seen at approximately the one-minute mark) that were standard yolk color if not a tad deeper: We contacted Flamingo Gardens in Fort Lauderdale to ask whether it was true that flamingo egg yolks are pink. A resident flamingo expert there told us that wasn't the case, that flamingo yolks were not dissimilar in color to chicken egg yolks. We also contacted Flamingo expert Caitlin Kight, author of the 2015 book Flamingo about the rumor, who in turn consulted with University of Exeter animal researcher Paul Rose. Rose confirmed that flamingo yolks aren't literally pink — the yolks can vary in color from bright orange to reddish, he vouchsafed, but photographs showing them to be bright pink are completely unrealistic. In the ordinary course of development, flamingos do not start out their lives as pink — they gain that distinctive coloring through their diet as they mature: Smithsonian magazine, among others, offers an explanation for the gradual development of flamingo pigmentation:
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