A few of us sat out in the garden had our attention drawn to the sky as a Raven was heard calling. On looking up we were surprised to see it was a locally nesting Crow imatating, very well, a Raven call. This was in direct response to a Raven that was flying East to West to Cowm directly above him.

This was again repeated 2 mins later as another Raven followed in same direction which again, resulted in the same Raven calls from the Crow.

Really unusual to witness.