Mimicry: The raven monster able to mimic simple sounds which it has been heard, like a person who is whispering, such a baby is crying, or even an animal can be chittering. A creature which is hearing the sounds could be tell that they’re an imitations with the successful DC 10 Wisdom (Insight) check.
Beak: Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
Check about unicorn 5e monster
Attributes Of Raven Monster DnD 5E
10 ft., fly 50 ft.