Sea otters hold hands while sleeping so they don’t drift away from each other.
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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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Dolphins have names for one another.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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