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Many pair-bonding animals show physiological distress when separated.

These birds spend years traveling the ocean alone, yet they return to the same spot every year to meet their specific partner. Their "reunion" dances are highly choreographed and unique to each couple. xhamster sex animal videos hot

Perhaps the most iconic symbol of love, mute swans often form pair bonds that last until death. When one partner dies, the survivor has been known to exhibit signs of grief, sometimes remaining solitary for years afterward. sometimes remaining solitary for years afterward.