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Pigeons — technically rock doves — were likely domesticated at least 5,000 years ago, and are still surprisingly comfortable with humans.

Beautiful bright silver and glistening, they were described as "gray rock doves" and seemed more majestic and elegant than regular street pigeons.

The two city’s rock doves are genetically distinct, research shows.

Other fish also change their eyes' tint, and species including epaulette sharks and rock doves have attention-grabbing color patterns on their backs.

Although rock dove and raven remains were the most numerous birds, the remains of golden eagles were also present at 26 sites.