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I like this picture alot, you can see that each of them has one wing which reminds me of the jian. here is a copy pasta of the jian
The description of Jian (鹣) or Jianjian (鹣鹣) can be found in Classic of Mountains and Seas - Wikipedia (山海经), the earlist mythical geological book in China's history.
It has only one eye and one wing, can fly only when male and female lean together.
Thus, it has another Chinese name “比翼鸟”(lovebirds) which in direct translation is “the birds fly wing to wing”.
With such description, in Chinese culture and tradition, it used as metaphor to beloved couple.
There is famous sentence in a famouse ancient poem “在天愿作比翼鸟,在地愿为连理枝” (“On high, we’d be two lovebirds flying wing to wing; On earth, two trees with branches twined from spring to spring.” )