As the sun goes down on Whidbey Island, one seagull settles in to sleep on a piling at the Clinton ferry dock while another, appearing most menacing here, follows a ferry across Saratoga Passage to Mukilteo and the mainland. Seagulls sleep with their bills tucked into their feathers and will occasionally open their eyes to look around to ensure they are safe. Studies of sleep patterns in seagull colonies have found that the frequency of opening their eyes is directly related to how often the birds near them open their eyes.
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