Featured on Episode 30
Mentioned in Fantastic Beasts: YES! M.O.M. Classification XXXX
Reported Locations: Northern Europe
Known Abilities: Horn, hair, and blood all possess highly magical properties
The Unicorn is a pure white horned horse. Its foals are born golden, and then turn silver before reaching adulthood. Unicorns can be found in forests throughout Northern Europe. They are not aggressive without cause, but should be treated with great respect.
Unicorns and mentions of unicorns appeared throughout the original Harry Potter series. Harry stumbled across a dead unicorn in Sorcerer’s/Philosopher’s Stone in the Forbidden Forest, and their tail hairs are often used in wand cores.
Professor Grubbly-Plank also teaches a lesson on unicorns in Goblet of Fire.
Unicorns have not yet appeared in the Fantastic Beasts films.
ACCORDING TO NEWT SCAMANDER
The unicorn is a beautiful beast found throughout the forests of northern Europe. It is a pure white, horned horse when fully grown, though the foals are initially golden and turn silver before achieving maturity.
The unicorn’s horn, blood and hair all have highly magical properties. It generally avoids human contact, is more likely to allow a witch to approach it than a wizard, and is so fleet of foot that it is very difficult to capture.
Source: Fantastic Beasts and Where to Find Them