Mockingbird (5e Creature)
From D&D Wiki
Tiny beast, unaligned
Mimicry. The mockingbird can mimic simple sounds it has heard, such as a person whispering, a baby crying, or an animal chittering. A creature that hears the sounds can tell they are imitations with a successful DC 10 Wisdom (Insight) check.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
'Remember it's a sin to kill a mockingbird.'