What fascinating anatomical feature does the Northern Harrier possess that is also found in owls?

Answer

A facial disc of stiff feathers

The Northern Harrier possesses stiff feathers surrounding its face that form a concave structure, directing sound waves toward its ears, a trait unusual for a diurnal raptor.

What fascinating anatomical feature does the Northern Harrier possess that is also found in owls?
behaviorbirdraptorHarrier