Unicorns are mythological creatures, so no one has actually "documented" their feeding process as a scientist could for a real living animal.
However, in every mythology that has unicorns, they appear to eat in roughly the same way as horses. This requires them to graze on grasses and chew the grasses in their mouths. In some legends, the Unicorn can drink water through its hooves, but the dominant tradition is that they drink water in the same manner as horses.
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Theres no such thing as unicorns
Unicorns do not exist.
Unicorns are mythical creatures, so there is no specific documented lifespan for them. In folklore and literature, unicorns are often portrayed as immortal or living for centuries.
Well, if they aren't horny, they're horses.
Unicornology.