As a warning call, a similar but more barking honk is given two or three times in short succession.

Its purpose is, however, unknown; it is certainly not a warning call.

Then it's possible that was some kind of a warning call.

He was like a man listening for a warning call.

We're trying to run down where the warning call came from.

According to the warning call they had received, the bomb was due to go off in 45 minutes.

He walked to where a booth stood beside the gate, to a phone and his warning call.

At 12:31 a third and final warning call to the Palestine Post newspaper was made.

From down slope came the sounds of running men, a warning call, and then a gunshot.

If a predator is seen, they will make a warning call.