Mimicry. The dire raven can mimic simple sounds it has heard, such as a person whispering, a baby crying, or an animal chittering. A creature that hears the sound can tell that thet are imitations with a successful DC 10 Wisdom (Insight) check.

Variant birds

You can use the stat block for for the dire raven to represent other birds with minor alterations. For example;

A dire eagle or dire hawk would replace the Mimicry trait with Keen Sight and attack with its talons rather than its beak, using the same statistics but dealing slashing damage rather than piercing.

A dire owl would replace the Mimicry trait with Flyby and Keen Hearing and Sight, gain darkvision out to 120 ft and attack with its talons rather than its beak, dealing 4 (1d4 + 2) slashing damage on a hit.